1. To sail or travel about, as for pleasure or reconnaissance.
2. To go or move along, especially in an unhurried or unconcerned fashion.
3. To travel at a constant speed or at a speed providing maximum operating efficiency for a sustained period.
4. To move leisurely about an area in the hope of discovering something; such as, "The taxis were cruising for fares."
5. The act or an instance of cruising, especially a sea voyage for pleasure.
6. Etymologically: Dutch kruisen, to cross, from kruis, cross, from Middle Dutch cruce, from Latin crux, cruc-, "cross".