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

• adjective denoting a quantity consisting of twenty-six items or units; -- representing the number twenty-six as Arabic numerals.

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

• noun The cardinal number twenty-six.

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

• adjective being six more than twenty
• noun the cardinal number that is the sum of twenty-five and one