1. One who squats; specifically, one who settles unlawfully upon land without a title. In the united states and australia the term is sometimes applied also to a person who settles lawfully upon government land under permission and restrictions, before acquiring title. In such a tract, squatters and trespassers were tolerated to an extent now unknown. (Macaulay)
2. (Science: zoology) See squat snipe, under Squat.