|Origin:||, past participle of permeare 'to go through'|
1 [intransitive always + adverb/preposition, transitive]
if liquid, gas etc permeates something, it enters it and spreads through every part of it:
The smell of diesel oil permeated the air.
Rain permeates through the ground to add to ground water levels.
if ideas, beliefs, emotions etc permeate something, they are present in every part of it:
Racism continues to permeate our society.
An emotional intensity permeates every one of O'Connor's songs.