(1):

(n.) An officer appointed and commissioned to collect and receive customs, duties, taxes, or toll.

(2):

(n.) One who collects things which are separate; esp., one who makes a business or practice of collecting works of art, objects in natural history, etc.; as, a collector of coins.

(3):

(n.) A compiler of books; one who collects scattered passages and puts them together in one book.

(4):

(n.) One authorized to collect debts.

(5):

(n.) A bachelor of arts in Oxford, formerly appointed to superintend some scholastic proceedings in Lent.