second nature

1. 1.

   acquired behavior that is practiced so long it seems innate

   Broaderhabit

Questions about second nature

What does second nature mean?

second nature means "acquired behavior that is practiced so long it seems innate".

Is second nature a common word?

second nature is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.