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-est1

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  1. a suffix forming the superlative degree of adjectives and adverbs: warmest; fastest; soonest.
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Origin of -est1

Middle English; Old English -est, -ost. Compare Greek -isto-

-est2

  1. a native English suffix formerly used to form the second person singular indicative of verbs: knowest; sayest; goest.
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Also -st.

Origin of -est2

Middle English; Old English -est, -ast, -st, 2nd person singular present indicative endings of some verbs (-s earlier verbal ending + -t, by assimilation from thū thou1) and 2nd person singular past endings of weak verbs (earlier -es + -t)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -est

-est1

suffix
  1. forming the superlative degree of adjectives and adverbsshortest; fastest
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Word Origin

Old English -est, -ost

-est2

-st

suffix
  1. forming the archaic second person singular present and past indicative tense of verbsthou goest; thou hadst
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Word Origin

Old English -est, -ast
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012