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A bill is a formal or public writing or declaration of one’s claim against another. A bill may also be an equitable pleading of a claim in a court of equity. At early common law, a bill in equity was analogous to a declaration in law.

A bill may also be a statement indicating that one owes a certain sum of money to another; an invoice or itemized list of charges.

Another common definition of bill is a legislative proposal offered for debate prior to its enactment into law; a draft of a statute before it is enacted into law. 

[Last updated in June of 2021 by the Wex Definitions Team]