Meaning

noun a person authorized to act for another

noun a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set

originEtymology tree English place Proto-Germanic *haldaną Proto-West Germanic *haldan Old English healdan Middle English holden English hold 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 holder English placeholder From place + holder.

Etymology from Wiktionary, CC BY-SA 3.0