noun
replacement; substitution; displacement
Refers to the act or result of replacing one thing with another, or the thing that replaces. Can be used in technical contexts like mathematics, computing, or everyday situations.
古い部品を新しいものに置き換えする必要がある。
We need to replace the old parts with new ones.
この式では、xをyに置き換えて計算してください。
In this formula, please substitute y for x and calculate.
Compound of 置き (continuative form of 置く 'to place') + 換え (continuative form of 換える 'to exchange'). Literally 'placing and exchanging', referring to the act of replacing something.