a career

(telecommunications) a carrier / (genetics, pathology) carrier / (physics, electronics) carrier

permission from both sets of parents to marry / (rare) someone so permitted: a fiancée (female) or fiancé (male)

to permit one's child to marry

key (to open a lock) / the clue to a problem / key (on the keyboard of a piano etc.) / key (on the keyboard of a computer) / key (a pitch in music)

chi

footnote

a big brother (someone who is considered one's senior) / (slang) a big bro (gang leader)

to erase, clear

(botany) the platycodon or Chinese bellflower, Platycodon grandiflorus