(1):
(v. i.) To use the words thou and thee in discourse after the manner of the Friends.
(2):
(v. t.) To address as thou, esp. to do so in order to treat with insolent familiarity or contempt.
(3):
(obj.) The second personal pronoun, in the singular number, denoting the person addressed; thyself; the pronoun which is used in addressing persons in the solemn or poetical style.