n. The quality of being invariable; invariableness; constancy; uniformity.
the GNU version of the Collaborative International Dictionary of English
n. The quality of being invariable; invariableness; constancy; uniformity.
The Century Dictionary and Cyclopedia
n. Lack of variability or of liability to change; invariableness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a quality of uniformity and lack of variation
n. the quality of being resistant to variation
Word Usage
"In his early years, Linnaeus believed that the species was not only real, but unchangeable — as he wrote, Unitas in omni specie ordinem ducit (The invariability of species is the condition for order [in nature])."