Designating a vehicle or equipment designed for use on rough or difficult terrain. Also (of driving, cycling, etc.): done on rough or difficult terrain, making use of this type of vehicle or equipment.
Origin
1950s; earliest use found in The Lima News. From all + terrain.
Definition of all-terrain in US English:
all-terrain
adjective
US
Designating a vehicle or equipment designed for use on rough or difficult terrain. Also (of driving, cycling, etc.): done on rough or difficult terrain, making use of this type of vehicle or equipment.
Origin
1950s; earliest use found in The Lima News. From all + terrain.