vi·car·i·ance (v -kâr  - ns, -k r-, v -)n. Biology The separation or division of a group of organisms by a geographic barrier, such as a mountain or a body of water, resulting in differentiation of the original group into new varieties or species. [From vicariant, from Latin vic  rius, vicarious; see vicarious.]vi·car i·ant adj. & n. |
| vicariance (v-kâr-ns, v-) The separation or division of a group of organisms by a geographic barrier, such as a mountain or a body of water, resulting in differentiation of the original group into new varieties or species. See also speciation. |
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