Kyūjitai form of 軍団 (“corps”)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

an army, corps / (collectively) the armed forces, military / (military) forces

(archaic) antique, old-fashioned / (colloquial) ancient

ancient times, antiquity, remote ages

a piece of research, a study, investigation

to research, to study

association