Root word for invasion

Answer 1

-vad-, -vas- means "to go".

evade v. (L. evadere, to pass beyond, to escape. e-, out, from + -vad-, to go) To attempt to escape; to practice artifice or sophistry, for the purpose of eluding.

evasion n. (e-, out, from +-vas-, to go +-ion, S, P, R, A) The act of eluding, avoiding, or escaping, particulary the pressure of an argument, accusation, charge, or interrogation; subterfuge; prevarication; equivocation; artifice

evasive (GRE) adj.. (e-, out, from + -vas-, to go + -ive, related to, Qu, T) Tending to evade, or marked by evasion; elusive; shuffling; avoiding by artifice.

invasion n. (in-, in + -vas-, to go + -ion, S, P, R, A) The act of invading; the act of encroaching upon the rights or possessions of another; encroachment; trespass.

pervade v. (per-, through + -vad-, to go) To pass or flow through, as an aperture, pore, or interstice; to permeate; imbue. To pass or spread through the whole extent of; to be diffused throughout.

pervasion n. (per-, thoroughly + -vas-, to go + -ion, S, P, R, A) The act or state of pervading, passing, or spreading through the whole extent of a thing.

pervasive n. (per-, thoroughly + -vas-, to go + -ive, related to, Qu, T) Tending to pervade, or having power to spread throughout; permeating.

(engage, invader, L. vade mecum (go with me, a manual or handbook that a person always carries.)

Answer 2

The root word for "invasion" is "invade." It means to enter forcefully or intrude upon an area or territory.