noun which may take the genitive case particle 'no', na-adjective, noun
appropriate; suitable; fitting
Used to describe something that matches the situation, status, or effort. Often implies a proportional or commensurate relationship.
それ相応の努力をすれば、結果はついてくる。
If you put in the appropriate effort, results will follow.
He received a suitable reward.
相応 alone means 'suitable' or 'commensurate', but それ相応 emphasizes that the suitability is relative to a specific context or standard.
Compound of それ (that) and 相応 (suitable, appropriate). The combination emphasizes that something is appropriate in relation to a particular context or standard.