Boolean Modifier: ( )

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Enclosing terms and a Boolean operator within parentheses creates a Boolean expression that functions as a single unit/condition that can interact with other terms, expressions, phrases, and operators.

Example: The query (aroma not flavor) and ("turmeric" or "curcumin") returns only results that contain plurals/synonyms/alternate spellings of aroma, but not plurals/synonyms/alternate spellings of flavor and also contain turmeric, curcumin, or both.