(1):

(n.) One who sues or prosecutes a demand in court; a party to a suit, as a plaintiff, petitioner, etc.

(2):

(n.) Especially, one who solicits a woman in marriage; a wooer; a lover.

(3):

(n.) One who sues, petitions, or entreats; a petitioner; an applicant.

(4):

(n.) One who attends a court as plaintiff, defendant, petitioner, appellant, witness, juror, or the like.