An explication is a slow, careful explaining of an idea. You do not stop at one neat sentence. You open the thing out, piece by piece, and show how the parts work together — a poem, a rule, a hard thought. Teachers and writers use this word when they walk through a text or an argument in that close way. It feels formal. At the shops people just say explanation; though actually those two are neighbours, not twins, and explication is the one that takes its time.

闡釋（書面；比「說明」更細）