Definitions for "Void of course"
A term describing a planet that does not make a major aspect before changing Signs. It is used primarily with respect to the Moon.
A planet is void-of-course after it has made its last aspect within a sign, but before it has entered a new sign.
"is when a Planet is separated from one, and doth not apply to any other while he is in that Sign, and it is most observable in the Moon." [PA