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singular only

Singular-only nouns (also called mass nouns) refer to nouns that are either abstract or too numerous to count (because they are a substance or exist in masses).

Examples include concepts or traits like knowledge, justice and wisdom. Other examples are substances that are non-quantifiable, or exist in a form which cannot be counted, (e.g., milk, rice or water).

What’s the Plural of Series?

The plural and singular of series is series. Series already refers to a number of things, and so it stays the same either way.