English
market share
From market + share.
Proto-Italic *merks
…
Latin mercor ‘to trade’
Latin mercātus ‘trade’
Old English market
Middle English market ‘a market’
English market
Proto-Indo-European *(s)koréh₂
Proto-Germanic *skarō ‘a division’
Proto-West Germanic *skaru
Old English sċearu ‘a cutting’
Middle English schare ‘a portion or share’
English share
Today it means
noun The percentage of some market held by a company, country, (sub)sector or any other actor or aggregate.
Language periods are conventional ranges, not dates for this word.
Etymograph / market share