Noun
1. the state of being joined together
2. the inflection of verbs
3. the complete set of inflected forms of a verb
4. a class of verbs having the same inflectional forms
5. the act of pairing a male and female for reproductive purposes;
"the casual couplings of adolescents""the mating of some species occurs only in the spring"6. the act of making or becoming a single unit;
"the union of opposing factions""he looked forward to the unification of his family for the holidays"