Of or pertaining to thee: possessive of the pronoun thou, second person singular. It is used in solemn and grave style. See thine.
the GNU version of the Collaborative International Dictionary of English
pronoun.
Of thee, or belonging to thee; the more common form of thine, possessive case of thou; -- used always attributively, and chiefly in the solemn or grave style, and in poetry. Thine is used in the predicate. See thine.