noun

• (dated) A person who wanders from place to place; a nomad, a wanderer.
• (specifically) A person without settled employment or habitation who usually supports himself or herself by begging or some dishonest means; a tramp, a vagabond.
  "Every morning before work, I see that poor vagrant around the neighbourhood begging for food."
• (biology, especially ornithology) An animal, typically a bird, found outside its species' usual range.

adj

• (figurative) Moving without a certain direction; roving, wandering; also, erratic, unsettled.
  "Let Prudence yet obſtruct thy venturous way; / And take good heed, what men will think and ſay: / That beauteous Emma vagrant courſes took; / Her father's houſe and civil life forſook; / That, full of youthful blood, and fond of man; / She to the wood-land with an exile ran."