Meaning

adjective quantifier; used with either mass nouns or plural count nouns to indicate an unspecified number or quantity

adjective relatively much but unspecified in amount or extent

adjective relatively many but unspecified in number

originFrom Middle English som, sum, from Old English sum (“some, a certain one”), from Proto-West Germanic *sum, from Proto-Germanic *sumaz (“some, a certain one”), from Proto-Indo-European *sem- (“one, whole”). Cognate Scots sum, some (“some”), North Frisian som, sam, säm (“some”), West Frisian sommige, somlike (“some”), dialectal Dutch som, saom (“some”), standard Dutch sommige (“some”), Low German…

Etymology from Wiktionary, CC BY-SA 3.0