Antecedental

preceding; prior:
an antecedent event.
a preceding circumstance, event, object, style, phenomenon, etc.
antecedents.

.
the history, events, characteristics, etc., of one’s earlier life:
Little is known about his birth and antecedents.

Grammar. a word, phrase, or clause, usually a substantive, that is replaced by a pronoun or other substitute later, or occasionally earlier, in the same or in another, usually subsequent, sentence. In Jane lost a glove and she can’t find it, Jane is the antecedent of she and glove is the antecedent of it.
Mathematics.

the first term of a ratio; the first or third term of a proportion.
the first of two vectors in a dyad.

Logic. the conditional element in a proposition, as “Caesar conquered Gaul,” in “If Caesar conquered Gaul, he was a great general.”.
noun
an event, circumstance, etc, that happens before another
(grammar) a word or phrase to which a pronoun refers. In the sentence “People who live in glass houses shouldn’t throw stones,” people is the antecedent of who
(logic) the hypothetical clause, usually introduced by “if”, in a conditional statement: that which implies the other
(maths) an obsolescent name for numerator (sense 1)
(logic) denying the antecedent, the fallacy of inferring the falsehood of the consequent of a conditional statement, given the truth of the conditional and the falsehood of its antecedent, as if there are five of them, there are more than four: there are not five, so there are not more than four
adjective
preceding in time or order; prior

late 14c. (n. and adj.), from Old French antecedent (14c.) or directly from Latin antecedentem (nominative antecedens), present participle of antecedere “go before, precede,” from ante- “before” (see ante) + cedere “to yield” (see cede). Used as a noun in Latin philosophical writings.

antecedent an·te·ce·dent (ān’tĭ-sēd’nt)
n.
A precursor.