Bracket is a term with multiple meanings: as a noun, it can refer to a pair of punctuation marks ( ) used to enclose supplementary information, or a support structure (e.g., for a shelf); as a verb, it means to place within brackets or to group together for comparison or classification. In British English, "bracket" is also used in contexts like tax brackets (income ranges) and sports tournament brackets (competition structure). The word originates from the Old French "braguette" and has evolved to cover both physical and abstract grouping concepts.

【常见问题】

问题1：What is the exact bracket definition in English grammar?

回答1：In English grammar, bracket definition refers to the punctuation marks ( ) used to insert additional information, clarify meaning, or indicate parentheses. The term "bracket" is often used interchangeably with "parenthesis" in British English, though technically square brackets [ ] are also called brackets.

问题2：How is bracket used in financial contexts?

回答2：In financial contexts, bracket is commonly used in "tax bracket" to describe income ranges that determine tax rates. For example, a person in the 22% tax bracket pays that percentage on income above a certain threshold. The bracket meaning here emphasizes grouping by numerical range.

问题3：What does bracket mean in sports tournaments?

回答3：In sports, bracket refers to a visual diagram showing the matchups and progression of teams in a knockout tournament, such as the NCAA basketball bracket. The bracket structure helps track winners and losers, with each "bracket" representing a segment of the competition.