operation, n.
- verkun
= action
-> external composition, external operation, group operation, left operation, right operation - aðgerð, reikniaðgerð
= algebraic operation, law of composition
-> arithmetic operation, associative operation, binary operation, Boolean operation, bracket operation, commutative operation, elementary operation 1, internal composition, internal operation, logical operation, one-place operation, partial algebraic operation, partial operation, set operation, set-theoretical operation, unary operation - aðgerð
-> column operation, elementary operation 2, row operation