ther|mo|rem|a|nence «THUR moh REHM uh nuhns», noun.
1. the magnetism remaining in a substance that was once molten and then cooled at the Curie point.
2. a method of determining the age of a rock or other substance by measuring its remanent or residual magnetism against the present-day magnetism of the earth.
Useful english dictionary. 2012.