1 conditional (on/upon sth) that only happens if sth else is done or happens first 有条件的: My university place is conditional on my getting good marks in the exams. 大学录取我的条件是我必须在考试中取得好成绩。 [OPP] unconditional 反义词为unconditional

2 (grammar语法) describing a situation that must exist before sth else can happen. A conditional sentence often contains the word ‘if’ （表示有条件的，条件句常包含if）: ‘If you don't study, you won't pass the exam’ is a conditional sentence. If you don't study, you won't pass the exam是个条件句。