1. grammar inflection of verb: the different patterns of inflection of a given verb
2. grammar group of verbs with same inflections: a group of verbs that use the same patterns of inflection
3. grammar set of verb inflections: the complete set of inflections for a verb
4. act of joining together: the act of joining or uniting, or the state of being joined
5. biology reproduction in simple organisms: the simplest form of reproduction, in which two single-celled organisms such as bacteria or protozoans link together, exchange genetic information, and then separate
6. biology fusion of nuclei: the fusion of the nuclei of a male and a female gamete in algae and fungi
7. genetics pairing of chromosomes: the distribution of pairs of chromosomes into the four nuclei produced by the division of a parent nucleus
8. chemistry alternation of number of bonds: the occurrence of two or more double or triple bonds in alternation with single bonds in a molecule
