Definitions
1.nounAny thing that precedes another thing, especially the cause of the second thing.
2.nounAn ancestor.
3.noun(grammar) A word, phrase or clause referred to by a pronoun.
4.nounThe conditional part of a hypothetical proposition, i.e. p \rightarrow q, where p is the antecedent, and q is the consequent.
5.nounThe first of two subsets of a sequent, consisting of all the sequent's formulae which are valuated as true.
6.nounThe first term of a ratio, i.e. the term a in the ratio a:b, the other being the consequent.
7.noun(chiefly in the plural) Previous principles, conduct, history, etc.
8.adjectiveEarlier, either in time or in order."an antecedent cause"
9.adjectivePresumptive."an antecedent improbability"