Merriam-Webster’s Advanced Learner’s English Dictionary – For ESL, EFL, ELL, & TEFL Study & Instruction by Merriam-Webster

Created by America’s foremost language experts, this dictionary is designed to help advanced students master spoken and written English, as it is actually used.

With in-depth and up-to-date coverage of basic English vocabulary, grammar, and usage, this dictionary features 100,000 words and phrases with definitions that are easy for learners to understand.