Short for アマチュア無線 (amachua musen, “amateur radio”).

a hobby (activity done for enjoyment in spare time) / one's taste (set of preferences)

wireless

an on-the-spot maid who was hired in Japan or China by foreigners / women who work on foreign routes

amateur

(chiefly women's speech) first person singular pronoun: I, me

(informal) being extremely sweet

(common name) Pandalus eous, a species of shrimp valued in Japan

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness