n. A planet that is supposed to rule some specific thing
the GNU version of the Collaborative International Dictionary of English
n. One who, or that which, signifies.
The Century Dictionary and Cyclopedia
n. One who or that which signifies or makes known by words, signs, etc.; in astrology, specifically, a planet ruling a house; especially, the lord of the ascendant (which is the significator of life); the apheta. See the quotation.
Word Usage
"The significator was the center of the compass rose of her fate."