pervade

to spread throughout

Roots

per-: through, thoroughly, or completely
vad / vas: go, move, or pass through

Other words with the vad / vas root

evade: to avoid or escape
evasive: avoiding direct answer or capture
invade: to enter forcefully or intrusively
invasive: spreading intrusively or entering where unwanted
pervasive: spread throughout or present everywhere

Per- gives through; vade gives go. Pervade is to go through the whole space.

A sense of relief pervaded the room after the test ended.

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