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The dictionary by Merriam-Webster is America's most trusted online dictionary for English word definitions, meanings, and pronunciation. #wordsmatter

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First published in 1869, Nature is the world’s leading multidisciplinary science journal. Nature publishes the finest peer-reviewed research that drives ground-breaking discovery, and is read by thought-leaders and decision-makers around the world.

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We develop educational courseware, assessment, and technology-powered services that help people everywhere make progress in their lives through learning.

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Meet the LMS putting collaboration at the heart of the learning by connecting the people, content, and systems that fuel education. Sign up for free!

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Dictionary.com is the world’s leading online source for English definitions, synonyms, word origins and etymologies, audio pronunciations, example sentences, slang phrases, idioms, word games, legal and medical terms, Word of the Day and more. For over 20 years, Dictionary.com has been helping millions of people improve their use of the English language with its free digital services.

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Home | University of California, Berkeley.

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Cornell University is a private research university that provides an exceptional education for undergraduates and graduate and professional students. Cornell's colleges and schools encompass more than 100 fields of study, with locations in Ithaca, New York, New York City and Doha, Qatar.

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Columbia University in the City of New York.

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بزرگ ترین پروژه آموزش آنلاین ایران - ارائه آموزش‌های ویدئویی و فیلم‌های آموزشی هوش مصنوعی، مهندسی کامپیوتر، برق، مکانیک، عمران، صنایع و سایر رشته‌های مهندسی

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Mission-driven organization representing over 6,000 of the world’s leading colleges, schools, and other educational organizations.