n.

1. 【文】詞形變化
2. 結合；配合

n.

1. Grammar  the variation of the form of a verb, by which the voice, mood, tense, number, and person are identified.
   ▸the class in which a verb is put according to the manner of this variation.
2. Biology  the temporary union of two bacteria or unicellular organisms for the exchange of genetic material.
   ▸the fusion of two gametes.
3. Chemistry  the sharing of electron density between nearby multiple bonds in a molecule.