1. southing - Noun
2. southing - Verb
of South
Tendency or progress southward; as, the southing of the sun.
The time at which the moon, or other heavenly body, passes the meridian of a place.
Distance of any heavenly body south of the equator; south declination; south latitude.
Distance southward from any point departure or of reckoning, measured on a meridian; -- opposed to northing.
Source: Webster's dictionary