group

(noun) any number of entities (members) considered as a unit. Synonyms: grouping.

(noun) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule. Synonyms: radical, chemical group.

(noun) a set that is closed, associative, has an identity element and every element has an inverse. Synonyms: mathematical group.

(verb) arrange into a group or groups. Examples: "Can you group these shapes together?."

(verb) form a group or group together. Synonyms: aggroup.