geometric progression

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A sequence, such as the numbers 1, 3, 9, 27, 81, in which each term is multiplied by the same factor in order to obtain the following term.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun analysis A sequence in which each term except the first is obtained from the previous by multiplying it by a constant value, known as the common ratio of the geometric progression.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (mathematics) a progression in which each term is multiplied by a constant in order to obtain the next term