Astrol. Obs. Also co-. [n. of agent in L. form from CONSIGNIFY.] A conjoint significator: see quots.
1647. Lilly, Chr. Astrol., vi. 49. Cosignificator is when you find another Planet in aspect or conjunction with that Planet who is the principall significator.
1652. Gaule, Magastrom., 87. In every house, the order, nomenclature, signification, joy, consignificator, etc.
1819. Jas. Wilson, Dict. Astrol., s.v., Aries is a cosignificator of all ascendants.