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-most

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  1. a combining form of most occurring in a series of superlatives: foremost; utmost.
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Origin of -most

Middle English -most; replacing Middle English, Old English -mest, double superlative suffix, equivalent to -ma superlative suffix (as in Old English forma first; compare Latin prīmus) + -est1; later identified with most
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -most

-most

suffix
  1. forming the superlative degree of some adjectives and adverbshindmost; uppermost
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Word Origin

Old English -mǣst, -mest, originally a superlative suffix, later mistakenly taken as derived from mǣst (adv) most
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

Word Origin and History for -most

superlative suffix of adjectives and adverbs, from Old English -mest (altered in Middle English by influence of most), a double superlative, from -mo, -ma (cf. Old English forma "first," meduma "midmost"), cognate with Latin -mus, + -est.

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Online Etymology Dictionary, © 2010 Douglas Harper