In Latin libra was a balance, the root of our libration, equilibrium; libella was the diminutive form of the same word, and from it has come our level, an instrument by which a balance is proved, or by which may be detected the horizontal plane. It is closely associated in use with the plumb, by which a line perpendicular to the horizontal is proved. The level is that on which there are no inequalities, hence in Masonry it is correctly used’ as a symbol of equality. “We meet upon the level” because Masonic rights, duties, and privileges are the same for all members without distinction. Source: 100 Words in Masonry
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