“the most important words for second language learners of English.”

“With approved use of the Cambridge English Corpus, Dr. Charles Browne, Dr. Brent Culligan and Joseph Phillips  have created a New General Service List (NGSL) of core high frequency vocabulary words for students of English as a second language . First published in early 2013, the NGSL provides over 92% coverage for most general English texts (the highest of any corpus-derived general English word list to date).  “

http://www.newgeneralservicelist.org/

Reference