antilogarithm

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

• noun The number for which a given logarithm stands; for example, if log x equals y, then x is the antilogarithm of y.

from The Century Dictionary.

• noun In mathematics: The complement of the logarithm of any sine, tangent, or secant up to that of 90 degrees.
• noun As commonly used, the number corresponding to any logarithm.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Math.) The number corresponding to a logarithm. The word has been sometimes, though rarely, used to denote the complement of a given logarithm; also the logarithmic cosine corresponding to a given logarithmic sine.

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

• noun mathematics The number of which a given number is the logarithm (to a given base).

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

• noun the number of which a given number is the logarithm