Definitions
1.noun(grammar) A construction showing an equal quality. In English, this is normally formed using as. For example, the equative of happy is as happy as.
2.noun(grammar) A word in the equative form.
3.noun(grammar) A grammatical case in certain languages, including Ossetic and Sumerian, that indicates something is like something else. English equivalents include he was the same age as her and he looks like him.
4.adjective(grammar) Of, pertaining to, or being an equative.