Meaning

noun any number of entities (members) considered as a unit

noun (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

noun a set that is closed, associative, has an identity element and every element has an inverse

originEtymology tree Proto-Indo-European *grewbʰ-der. Proto-Germanic *kruppazder. Frankish *kruppbor. Vulgar Latin *cruppus Italian gruppobor. French groupebor. ▲ Italian gruppobor. English group From French groupe (“cluster, group”), from Italian gruppo, groppo (“a knot, heap, group, bag (of money)”). In the "group theory" sense, calqued from French groupe, a term coined by the young French…

Etymology from Wiktionary, CC BY-SA 3.0