Emily Dickinson Lexicon

SQUARE, a. [W. cwâr: Fr. carré, quarré; perhaps Gr. αρω, contracted from καρω. This is probably not a contraction of L. quadratus.]

1. Having four equal sides and four right angles; as, a square room; a square figure.
2. Forming a right angle; as, an instrument for striking lines square. – Moxon.
3. Parallel; exactly suitable; true. She's a most triumphant lady, if report be square to her. [Unusual.] – Shak.
4. Having a straight front, or a frame formed with straight lines; not curving; as, a man of a square frame; a square built man.
5. That does equal justice; exact; fair; honest; as, square dealing.
6. Even; leaving no balance. Let us make or leave the accounts square. Three square, five square, having three or five equal sides, &c; an abusive use of square. Square root, in geometry and arithmetic. The square root of a quantity or number is that which, multiplied by itself, produces the square. Thus 7 is the square root of 49, for 7 x 7 = 49. In seamen's language, the yards are square, when they are arranged at right angles with the mast or the keel. The yards and sails are said also to be square, when they are of greater extent than usual. – Mar. Dict.