(linguistics) The situation where two or more forms appear in the same environment without a change in meaning, and without either one being considered incorrect.

(immunology) The mechanism by which an infectious organism changes its surface proteins in favor of circumventing a host immune response.

plural of variation compass

plural of elegant variation

plural of magnetic variation

plural of equivalent variation

(genetics) The variation of the number of copies (normally two) of a gene, or of sequences of DNA, in the genome of a specific individual; has been linked to some diseases

plural of copy number variation