rationalization; justification; reasoning
The act of providing a reason or justification for something, often after the fact. Can be used in both neutral and slightly negative contexts (making excuses).
He struggled to come up with a justification for being late.
This policy needs a clear rationale.
根拠 means grounds or basis (evidence). 理由付け is the process of providing that basis.
Standard kanji spelling.
Variant spelling using okurigana づけ instead of 付け.
Compound of 理由 (reason) + 付け (attaching, nominalized form of 付ける).