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  A condition or capability that must be met or possessed by a system or system element to satisfy a contract, standard, specification, or other formally imposed documents.
NIST SP 800-160 Vol. 1 from IEEE 610.12 - Adapted

  Statement that translates or expresses a need and its associated constraints and conditions.
NIST SP 800-160 Vol. 1 from ISO/IEC/IEEE 29148

  A phase of the Development Process wherein the top level definition of the functionality of the system is produced.
NISTIR 5153 under Requirements

  A feature or fimction that is necessary to satisfy the security needs of a typical commercial or govenmient organization. Failure to meet a Requirement may cause application restrictions, result in improper functioning of the system, or hinder operations. A Requirement contains the word shall and is identified by the letter "R."
NIST SP 800-13 [Withdrawn] under Requirement