A plural was a term used to indicate more than one of something.

In 2268, Hanar was confused by Leonard McCoy's usage of the royal we ("and then we'll see how you're responding.") after he asked him how many more injections he would require, commenting, "I see no reason for you to refer to yourself in the plural.". (TOS: "By Any Other Name")

In 2366, Data corrected Gosheven's assumption that the term "Sheliak" was the name of an individual, saying the term was plural for a species of non-humanoid lifeform. (TNG: "The Ensigns of Command")

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