What does at bat mean?

Definition. An official at-bat comes when a batter reaches base via a fielder's choice, hit or an error (not including catcher's interference) or when a batter is put out on a non-sacrifice. (Whereas a plate appearance refers to each completed turn batting, regardless of the result.)

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Is the word aircraft plural?

is both the singular and the plural form.

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What's line of your work?

: the work that a person does regularly in order to earn money

He's in a dangerous line of work.