a first language, a mother tongue, a native tongue, a native language

(linguistics, uncommon) a proto-language, a mother language (from which later daughter languages evolve)

an aunt (a parent’s sister or sister-in-law)

late spring / third month of the lunar calendar

a button (clothing) / a button (mechanical device)

a cemetery, a graveyard

(rare) maternal grandmother, mother's mother

boat; rowboat

Clipping of 航空母艦 (kōkū bokan, “aircraft carrier”).

(accounting) double-entry bookkeeping