[ 'kwɒdrətʃə ]
■ noun
1》 Mathematics the process of constructing a square with an area equal to that of a circle or other curved figure.
2》 Astronomy the position of the moon or a planet when 90° from the sun in the sky.
3》 Electronics a phase difference of 90° between two waves of the same frequency.
Origin
C16: from L. quadratura 'a square', from quadrare (see quadrate ).