astronomy

Kyūjitai form of 水文学: hydrology

hydrology

隻: boats / 石: (slang) transistors

堰: weir, embankment / 咳: cough / 関: frontier pass, close, relation / 席: seat, mat, banquet / 積: accumulate, store up, amass / 籍: record, register, list, census / 舎: house, dwelling, dwell, reside

関: Seki (a city in Gifu Prefecture, Japan); a surname

gender role

(linguistics) "role language": unique language usage serving as a marker of social identity in fictional speech

the Heisei period (Japanese era that began on 8 January 1989 and ended on 30 April 2019)

death, demise