This document defines and explains various key terms related to evolution and change, including adaptive radiation, allometric growth, allopatric speciation, allopolyploidy, artificial selection, autopolyploidy, biogeography, bottleneck effect, clines, convergent evolution, diploidy, directional selection, diversifying selection, founder effect, frequency-dependent selection, gametic isolation, genetic drift, gradualism, heterochrony, heterozygote advantage, homeotic genes, homologous structures, hybrid breakdown, natural selection, neutral variation, paedomorphosis, polymorphism, polyploidy, postzygotic barriers, prezygotic barriers, punctuated equilibrium, reduced hybrid viability,