(1):

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

(2):

(n.) Enlargement or extension of business transactions; esp., increase of the circulation of bank notes.

(3):

(n.) That which is expanded; expanse; extend surface; as, the expansion of a sheet or of a lake; the expansion was formed of metal.

(4):

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

(5):

(n.) The operation of steam in a cylinder after its communication with the boiler has been cut off, by which it continues to exert pressure upon the moving piston.

(6):

(n.) The enlargement of the ship mathematically from a model or drawing to the full or building size, in the process of construction.

(7):

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