p.pr. & ·vb.n. of south.
2. southing ·noun tendency or progress southward; as, the southing of the sun.
3. southing ·noun the time at which the moon, or other heavenly body, passes the meridian of a place.
4. southing ·noun distance of any heavenly body south of the equator; south declination; south latitude.
5. southing ·noun distance southward from any point departure or of reckoning, measured on a meridian;
opposed to northing.