The joinings of many into one, spoken plural — in types, a value lawfully one-of-several; in people, strength gathered.
Latin unio (oneness, unity, also a single large pearl), from unus (one), named a joining of many into one, whether of values or of people.
The joinings of many into one, spoken plural, a value lawfully allowed to be one of several kinds, or people's strength gathered by standing together.