(1):

(v. t.) To subject to the action of oxygen or of an oxidizing agent, so as to bring to a higher grade, as an -ous compound to an -ic compound; as, to oxidize mercurous chloride to mercuric chloride.

(2):

(v. t.) To combine with oxygen or with more oxygen; to add oxygen to; as, to oxidize nitrous acid so as to form nitric acid.

(3):

(v. t.) To remove hydrogen from (anything), as by the action of oxygen; as, to oxidize alcohol so as to form aldehyde.

(4):

(v. t.) To combine with oxygen, or subject to the action of oxygen, or of an oxidizing agent.