معنی کلمه :‌ expansion

Space through which anything is expanded; also, pure space.

An instrument to thrash with; a flail. [Obs. or Prov. Eng.] Halliwell.

The act of expanding or spreading out; the condition of being expanded; dilation; enlargement.

The developed result of an indicated operation; as, the expansion of (a + b)2 is a2 + 2ab + b2.