What does Black Moon Lilith mean?

Black Moon Lilith meaning in Symbols Dictionary

the original Black Moon Lilith may be the position associated with the mean lunar apogee as measured through the geocenter; variants of Black Moon consist of replacing the mean orbit with a "true" osculating orbit or with an interpolated orbit; charting the empty focus associated with the Moon's orbit as opposed to the apogee; and calculating the required point's barycentric or topocentric position instead of its geocentric place.