Noun, Suru verb, Transitive verb
replacement; substitution; change
もし、システムの完全な入れ替えが必要ということになれば、彼らは古いシステムで満足することと思う。If it's going to require a total restructuring, I'm sure they will be satisfied with the old system. shunting (rail); switching
Also written 入れ換え【いれかえ】、入替え【いれかえ】、入換え【いれかえ】、入替【いれかえ】、入換【いれかえ】