lunar inequality

noun

1

: one of many variations in the moon's motion from a true ellipse caused by the perturbation of the sun or the planets

2

: one of the nearly inappreciable fluctuations of the magnetic needle from its mean position due apparently to the moon

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now