Meaning

noun (logic) a word (such as `some' or `all' or `no') that binds the variables in a logical proposition

noun (grammar) a word that expresses a quantity (as `fifteen' or `many')

originEtymology tree English quantify Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English quantifier From quantify + -er.

Etymology from Wiktionary, CC BY-SA 3.0