1. forming the plural of nouns ending in the sounds ( (s) ), (; z) ), (; ʃ) ), and (; tʃ) ): an apostrophe can then be added to form the possessive plural ⇒ glasses, buzzes, fishes; witches' 2. forming the 3d person sing., pres. indic., of certain verbs ⇒ he kisses
Webster’s New World College Dictionary, Fourth Edition, compiled by the
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Wortherkunft von '-es'ME < OE -as, pl. inflection of masc. nouns; (sense 2) ME < Northumbrian OE -s, 3d pers. sing., pres. tense inflection of verbs