antecedent

/ˌæntɪˈsiːd(ə)nt/📚 17129雅思
An antecedent of something happened or existed before it and was similar to it in some way. 先例

noun [抽象名词]先例,前身;祖先,社会与家庭背景(antecedents);先行词,前述词;(逻辑)前件

We shall first look briefly at the historical antecedents of this theory.
我们首先简要地回顾一下该理论历史上的先例。

adjective [原级]先时的,先前的;(语法)先行的

In 'He grabbed the ball and threw it in the air', 'ball' is the antecedent of 'it'.
在He grabbed the ball and threw it in the air一句中,ball是it的先行词。

ante- 表示"前面,先"antecedent (aute+ced 走+ent→走在前面的[事] →前事)
ante(在…前面) + ced(走) + ent → 走在前面的 → 先行的
单词造句:
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You have sufficient reason for affirming the antecedent. 你有充分的理由肯定先例。
Upon contracting government projects, the antecedent money for bidding may be reduced by up to 50%. 承揽政府工程时,押标金、得降低百分之五十以下。