Open Dictionary of English

Open Dictionary of English (ODE) is a free multimedia dictionary and vocabulary resource associated with the LearnThat Foundation, an American 501(c)(3) nonprofit organization focused on English vocabulary and spelling education. Rather than functioning only as a conventional reference dictionary, ODE serves as the underlying lexical database for the foundation's broader LearnThatWord learning environment. The resource was created for English learners, students, teachers, parents, writers, and other users who need definitions together with contextual and learning-oriented support. The dictionary database is described as containing approximately 180,000 English words. Its entries combine material from multiple sources and may include definitions, pronunciation audio from different parts of the English-speaking world, video snippets showing words in context, user-submitted examples, idioms, images, and tutoring comments. This combination gives ODE a pedagogical orientation: the dictionary is intended not only to explain a word but also to help a learner recognize, remember, spell, and use it. ODE is closely integrated with LearnThatWord, the LearnThat Foundation's online vocabulary and spelling program. LearnThatWord uses the dictionary database to assemble goal modules, quizzes, and personalized review sequences. Users can choose prepared learning modules, create their own word lists, or select lists from an archive. The database also supports specialized collections, including a large spelling-bee module and an SAT-oriented vocabulary module. Frequency information from major English-language corpora is used to organize words into a progression from common and relatively accessible vocabulary toward less frequent and more advanced terms. The learning system uses adaptive quiz sessions and spaced-repetition principles. Vocabulary exercises can test a learner's ability to connect words with definitions, definitions with words, and images with words. Spelling exercises ask users to hear a word and enter its spelling, while a combined format uses definitions, usage examples, letter counts, and optional clues. The system records learning performance and returns unfamiliar words to later practice sessions, while words that have been mastered can be temporarily set aside. Free vocabulary tutoring is available to registered users, whereas spelling tutoring, performance reports, and some reward features have historically been associated with premium access. The Open Dictionary of English is therefore best understood as the content and reference layer of a nonprofit digital learning service rather than as a standalone mass-market dictionary publisher. Its positioning emphasizes accessibility, multimedia explanation, personalized practice, and integration with classroom and self-study workflows. LearnThatWord has offered teacher tools that allow educators to send vocabulary directly to student accounts, and the foundation has promoted access for English learners in different regions. The broader program accepts both United States and United Kingdom spelling variants, with additional localization described as under development in the available reference material. The associated organization began in 2004 under the name eSpindle Learning and adopted the LearnThat Foundation name in 2010, when its domain also moved to LearnThat.org. The core learning program was renamed LearnThatWord in August 2010. ODE remained the dictionary resource supporting that program. Publicly documented milestones include recognition through a Teachers' Choice Award in 2008 and inclusion of the organization as an innovator company by the Software and Information Industry Association in 2008 and again in 2011. Current ownership, operating status, leadership, and product availability are not established by the supplied sources.

Open Dictionary of English developed within the educational work of the LearnThat Foundation, an American nonprofit organization dedicated to vocabulary and spelling instruction. The organization was established in February 2004 as eSpindle Learning. Its stated motivation came from parents, educators, English-language learners, and writers seeking a more comprehensive way to study English vocabulary and spelling than a static word list or conventional dictionary could provide. The foundation's central resource became an extensive English word database, described in the available reference material as containing approximately 180,000 words. The database was designed to support both lookup and instruction. Entries could combine definitions from different sources with pronunciation audio, contextual video, images, idioms, usage examples, user samples, and tutoring notes. This structure positioned the Open Dictionary of English as a learner's dictionary with multimedia and community-oriented elements rather than solely as a traditional alphabetical reference work. The dictionary was integrated into a wider online learning system. LearnThatWord used ODE content to generate vocabulary quizzes, spelling exercises, combined word-recognition challenges, and goal-based study plans. Its practice model was adaptive: learners received feedback on their responses, unfamiliar words were returned to later sessions, and review was organized around repeated successful answers. The system also used word-frequency data from large English-language corpora to arrange vocabulary in a progression from common words to more advanced terms. Teachers could use classroom functions to assign words to student accounts, while learners could select prepared modules, build personal lists, or use archived lists. Recognition followed as the program matured. In 2008, the associated educational program received a Teachers' Choice Award from Learning Magazine. The Software and Information Industry Association also identified the organization as an innovator company in 2008 and again in 2011. These recognitions concerned the foundation's broader educational technology work, but ODE was an important content component of that work. A major organizational and branding change occurred in August 2010. eSpindle Learning changed its name to LearnThat Foundation, moved its domain to LearnThat.org, and renamed its principal learning program LearnThatWord. The Open Dictionary of English remained the dictionary and content database underpinning the renamed program. Around the beginning of the 2010–2011 school year, the foundation also introduced Vocabulary Junction, an initiative that offered free tutoring to third-grade pupils in the United States and Canada and was then expanded to English learners more broadly during their first three years of language study. The available sources do not establish a separate founding date, independent corporate structure, current leadership, present availability, or later ownership for the Open Dictionary of English itself. Its documented identity is that of a dictionary brand and learning resource operated within the LearnThat Foundation ecosystem.

• 2011

  Second innovator-company recognition

  [1]LearnThat Foundationen.wikipedia.org

  The Software and Information Industry Association again featured the LearnThat organization as an innovator company.

• 2010

  eSpindle Learning became LearnThat Foundation

  [1]LearnThat Foundationen.wikipedia.org

  The organization changed its name to LearnThat Foundation and moved its web domain to LearnThat.org.

• 2010

  LearnThatWord brand introduced

  [1]LearnThat Foundationen.wikipedia.org

  In August, the core learning program was renamed LearnThatWord, with ODE continuing to provide its dictionary database.

• 2010

  Vocabulary Junction literacy initiative launched

  [1]LearnThat Foundationen.wikipedia.org

  At the beginning of the 2010–2011 school year, the foundation began offering free tutoring to third-grade students in the United States and Canada.

• 2008

  Teachers' Choice Award recognition

  [1]LearnThat Foundationen.wikipedia.org

  The associated educational program received a Teachers' Choice Award from Learning Magazine.

• 2004

  LearnThat's predecessor organization was established

  [1]LearnThat Foundationen.wikipedia.org

  The organization that later became LearnThat Foundation was founded in February 2004 under the name eSpindle Learning.

A free, multimedia, learner-oriented English dictionary that functions as the lexical foundation for adaptive vocabulary and spelling education.

• Online learner's dictionary

  Open Dictionary of English

  The brand's principal reference resource is a large English learner's dictionary database described as containing about 180,000 words. Entries may combine definitions, pronunciation audio, contextual video, images, idioms, user examples, and tutoring comments. The dictionary is designed to support both independent lookup and structured vocabulary practice within LearnThatWord.

• Vocabulary and spelling learning platform · 2010

  LearnThatWord

  LearnThatWord is the wider learning program built around the ODE database. It provides adaptive vocabulary, spelling, and combined quizzes; personalized review; ready-made and user-created word lists; classroom tools; and, historically, premium features such as spelling tutoring and performance reports. It was the renamed core program of the LearnThat Foundation from August 2010.

• Literacy and tutoring initiative · 2010

  Vocabulary Junction

  Vocabulary Junction was a free tutoring initiative associated with the LearnThat Foundation. It began around the 2010–2011 school year for third-grade students in the United States and Canada and was subsequently described as expanding to English learners worldwide during their first three years of learning English.

• 2010Vocabulary Junction

  United States · Canada · Worldwide English-learning market

  The foundation launched Vocabulary Junction at the start of the 2010–2011 school year to provide free vocabulary tutoring initially to third-grade pupils in the United States and Canada, later broadening the intended audience to English learners worldwide.

  Outcome. The initiative was described as expanding beyond its initial school-age audience, but the supplied sources do not provide verified participation or outcome figures.

  Source

• 2010

  Organizational rebrand and program renamingStrategy

  Background

  The organization formerly known as eSpindle Learning reorganized its public identity and web presence.

  Action taken

  It adopted the LearnThat Foundation name, moved its domain to LearnThat.org, and renamed its core learning program LearnThatWord while retaining ODE as its dictionary resource.

  Aftermath

  The rebrand clarified the distinction between the foundation, its LearnThatWord learning platform, and the Open Dictionary of English database.

  Source

1. 1LearnThat Foundationen.wikipedia.org
2. 2LearnThat Foundation official websitelearnthat.org