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(practical) application; putting to practical use
applied (e.g. physics, linguistics, research)
理論を実際に応用することが大切だ。
It's important to apply theory in practice.
基礎知識を応用して問題を解いた。
I solved the problem by applying basic knowledge.
数学の応用問題は基礎をしっかり理解しないと解けない。
You can't solve applied math problems without a solid grasp of the basics.