-est 1suff. Used to form the superlative degree of adjectives and adverbs: greatest; earliest.[Middle English, from Old English -est, -ast, -ost.]-est 2 or -stsuff. Used to form the archaic second person singular of English verbs: comest.[Middle English, from Old English -est, -ast.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.-est suffix forming the superlative degree of adjectives and adverbs: shortest; fastest. [Old English -est, -ost]-est or -stsuffixforming the archaic second person singular present and past indicative tense of verbs: thou goest; thou hadst. [Old English -est, -ast]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014EST or E.S.T., Eastern Standard Time. -est1 , a suffix forming the superlative degree of adjectives and adverbs: fastest; soonest; warmest. [Middle English; Old English -est, -ost] -est2 or -st, an ending of the second person singular indicative of verbs, now occurring only in archaic forms or used in solemn or poetic language: knowest; sayest; goest.[Middle English; Old English -est, -ast, -st, 2nd pers. singular present indic. endings of some verbs (-s earlier v. ending + -t, by assimilation from th? thou1) and 2nd pers. singular past endings of weak verbs (earlier -es + -t)] est. 1. established. 2. estate. 3. estimate. 4. estimated. 5. estuary. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.