Syzygy

[Sarah]

The point of an orbit, as of the moon or a planet, at which itis in conjunction or opposition; -- commonly used in the plural.

[Sarah]

A word very valuable in situations where you are playing Scrabble and wish to temporarily infuriate your opponent with your apprent complete disregard for the simple dictionary-based rules of the game, only to have them remark in your favour with a certain astonishment when they discover it really is a word.

[Sarah]

The near perfect linear alignment of 3 or more celestial bodies (as in the sun the moon and the earth during a solar eclipse) in a gravatational system.

[Dianne]

A [lesbian orgy].

[Oralee]

A conjunction or opposition, especially of the moon with the sun.