L-Y-L-H – ‘tendency to association

It is the amalgamation of these three roots [לל, לו, לא] that forms the word in question. The words naught and knot, holding to the same root as the word night, portray very felicitously the figurative and hieroglyphic sense attached to the Hebrew word לילה. (The Hebraic Tongue Restored, Fabré d’Olivet, p. 35)

לל

The sign of extensive movement being opposed to itself, composes a root that gives the idea of circular movement…from two opposite forces, one drawing to the centre, the other drawing away from it.

לא

This root is the symbol of the line prolonged to infinity…the opposed ideas of being and nothingness…

לו

Every idea of liaison, cohesion, tendency of objects toward each other. The universal bond. (The Hebraic Tongue Restored, Fabré d’Olivet)