Meaning of SQUARE in English

SQUARE

I

In measurement, a device consisting of two straightedges set at a right angle.

It is used by carpenters and machinists to check the correctness of right angles, as a guide when drawing lines on materials before cutting, or for locating holes. In mechanical drawing or drafting, a T-shaped instrument known as a T square is used to establish a horizontal reference on the drafting board.

II

[c mediumvioletred] (as used in expressions)

{{link=Red Square">Red Square

square dance

Square Deal

Tiananmen Square

least squares method

Britannica English dictionary.      Английский словарь Британика.