سال
type: Concept
preferred label: year @en
related: نیم‌سال

ماه (جزء فصل)
type: Concept
preferred label: month @en
related: نیم‌سال

نیم‌سال
type: Concept
broader: مدت
preferred label: semester @en
related: ماه (جزء فصل)
related: سال

مدت
type: Concept
narrower: نیم‌سال
preferred label: duration @en