Etymology of unity, union, unit

The word unity comes from the French unite, from Latin unitatem, from unus (one) which is related to the Greek oenos (ace). See also "Etymology of one" here.

From the same root: union, unit

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Etymology of one

The word one comes from the Latin unus, which is related to the Greek oenos [one, ace in dice; Gr: οινός].

Note: Some etymologize unus from the gen. enos of eis [one; Gr: εις].

From the same root: unity, unique.

In modern Greek :a) enas: one [Gr: ένας]
b) enotita: unity [Gr: ενότητα]

OED
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