biennial
alternative label: CADA 2 AÑOS
related: triennial
related: annual
broader: periodicity
preferred label: دو سال یکبار @fa
type: Concept

triennial
preferred label: سه سال یکبار @fa
type: Concept
related: biennial

annual
preferred label: سالیانه @fa
type: Concept
related: biennial

periodicity
preferred label: تناوب @fa
type: Concept
narrower: biennial