aptar

A rare, little-used verb meaning to adapt, fix, or adjust — largely eclipsed by adaptar and ajustar in everyday and even formal Spanish, so most native speakers today would not recognize or use it.

• El mecanismo se aptó al nuevo motor. — The mechanism was adjusted to the new engine.
• Aptaron el plan a las nuevas condiciones. — They adapted the plan to the new conditions.
• Es difícil aptar el diseño sin rehacerlo. — It's hard to adjust the design without redoing it.

Reaching for aptar instead of adaptar in ordinary writing or speech — a native speaker will find aptar unfamiliar or archaic-sounding; adaptar is the verb you actually want almost every time.

Often confused with adaptar.