Invade, v. t. [imp. & p. p. Invaded; p. pr. & vb. n. Invading.]
Etymology: [L. invadere, invasum; pref. in- in + vadere to go, akin to E. wade: cf. OF. invader, F. envahir. See Wade.]
1. To go into or upon; to pass within the confines of; to enter; -- used of forcible or rude ingress. [Obs.] Which becomes a body, and doth then invade The state of life, out of the grisly shade. Spenser.
2. To enter with hostile intentions; to enter with a view to conquest or plunder; to make an irruption into; to attack; as, the Romans invaded Great Britain. Such an enemy Is risen to invade us. Milton.
3. To attack; to infringe; to encroach on; to violate; as, the king invaded the rights of the people.
4. To grow or spread over; to affect injuriously and progressively; as, gangrene invades healthy tissue.
1 more senses
Syn. -- To attack; assail; encroach upon. See Attack.
1 other Webster entry under this spelling
Invade, v. i.
To make an invasion. Brougham.
Shades of meaning
Fernald has no entry of its own for invade; he lists it under attack.
He lists it without comment; the entries above explain its neighbors.