Meaning of 事前同意 in Japanese

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Definition of 事前同意

じぜん(jizen) 【事前】

(n, adj-no) prior; beforehand; in advance; before the fact; ex ante →Related words: 事後
事前に予約を取っておくべきだ。
We'd better make a reservation beforehand.

どうい(doui) 【同意】

(n, vs, adj-no) agreement; consent; same opinion; approval
ボブはその計画に同意しなかった。
Bob did not agree to the plan.
same meaning