1. 先前：anterior 前面的 | anteriority 先前 | anteriorly 先前地
2. 先前, 居先：anterior || 前面的, 在前的 | anteriority || 先前, 居先 | anteriorly || 先前地, 居先地
noun
1. preceding in time
Synonym: priority antecedence antecedency precedence precedency
2. the quality of being in front or (in lower animals) toward the head