attendant (n.)

"one who waits upon another," early 15c., from the adjective or from French noun use of present participle of atendre (see attend).

late 14c., "solicitous, attentive," from Old French atendant, present participle of atendre "expect, wait for, pay attention" (see attend (v.)). Sense of "serving under, accompanying in a dependent position" is from c. 1400; that of "closely consequent" is from 1610s.