Thine is an archaic English pronoun meaning 'YOURS' or 'belonging to you'. It is used in the possessive form, and is often found in literature from the 16th and 17th centuries. The crossword solutions for the term THINE are YOURS (5 letters), YOUR (4 letters), and EVER (4 letters). YOURS is a possessive pronoun meaning 'belonging to you', while YOUR is also a possessive pronoun meaning 'belonging to you'. EVER is an adverb meaning 'at any time'.