any collection or assemblage of persons or things; cluster; aggregation: a group of protesters; a remarkable group of paintings.
a number of persons or things ranged or considered together as being related in some way.
Also called radical. Chemistry. two or more atoms specifically arranged, as the hydroxyl group, –OH. Compare free radical.
Linguistics. (in the classification of related languages within a family) a category of a lower order than a subbranch and of a higher order than a subgroup: the Low German group of West Germanic languages. any grouping of languages, whether it is made on the basis of geography, genetic relationship, or something else.
Geology. a division of stratified rocks comprising two or more formations.