A confidential servant of the king (Genesis 37:36; 39:1). In Romans 16:23 mention is made of "Erastus the chamberlain." Here the word denotes the treasurer of the city, or the quaestor, as the Romans styled him. He is almost the only convert from the higher ranks of whom mention is made (Comp. Acts 17:34). Blastus, Herod's "chamberlain" (Acts 12:20), was his personal attendant or valet-de-chambre. The Hebrew word saris, thus translated in Esther 1:10, 15; 2:3, 14, 21, etc., properly means an eunuch (as in the marg.), as it is rendered in Isaiah 39:7; 56:3.

Noah Webster's New International Dictionary of the English Language

1. (n.) An officer or servant who has charge of a chamber or chambers.

2. (n.) An upper servant of an inn.

3. (n.) An officer having the direction and management of the private chambers of a nobleman or monarch; hence, in Europe, one of the high officers of a court.

4. (n.) A treasurer or receiver of public money; as, the chamberlain of London, of North Wales, etc.