n. The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18.
the GNU version of the Collaborative International Dictionary of English
adj. Eight and ten.
n. The number greater by a unit than seventeen; eighteen units or objects.
n. A symbol denoting eighteen units, as 18 or xviii.
The Century Dictionary and Cyclopedia
Eight more than ten, or one more than seventeen: a cardinal numeral.
n. The sum of ten and eight, or seventeen and one.
n. A symbol representing eighteen units, as 18, or XVIII, or xviii.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the cardinal number that is the sum of seventeen and one
adj. being one more than seventeen
Word Usage
"(“There is nothing about resilience that I can say that my father did not first utter silently in eighteen years of living inside a two-dimensional cutout of himself.”)"