What is the definition of Latitude and Longitude?

Answer 1

Latitude is the angular distance north or south from the equator of a point on the earth's surface, measured on the meridian of the point. And longitude is an angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds.

Sources:

http://dictionary.reference.com/browse/longitude

http://dictionary.reference.com/browse/latitude

Answer 2

Latitude measures how far north or south a location is from the equator, with 0 degrees at the equator and 90 degrees at the poles. Longitude measures how far east or west a location is from the Prime Meridian, with 0 degrees at the Prime Meridian and up to 180 degrees east and 180 degrees west.