Meaning

noun British statesman who as Prime Minister pursued a policy of appeasement toward fascist Germany (1869-1940)

noun the treasurer of a municipal corporation

noun an officer who manages the household of a king or nobleman

originFrom Middle English chamberlein, chaumberlein, chaumberleyn, from Anglo-Norman chamberlenc, Old French chamberlayn, chamberlenc (“chamberlain”), from Frankish *kamarling (“chamberlain”), equivalent to *kamer (“chamber”) + *-ling (“-ling”). Cognate with Old High German chamarling (“chamberlain”). Compare also Late Latin camerārius and comrade. More at chamber, -ling.

Etymology from Wiktionary, CC BY-SA 3.0