{"data":{"id":"us/14-cfr-1.3","jurisdiction":"us","citation":"14 CFR 1.3","heading":"Rules of construction.","body":"(a) In this chapter, unless the context requires otherwise:\n(1) Words importing the singular include the plural;\n(2) Words importing the plural include the singular; and\n(3) Words importing the masculine gender include the feminine.\n(b) In this chapter, the word:\n(1) Shall is used in an imperative sense;\n(2) May is used in a permissive sense to state authority or permission to do the act prescribed, and the words “no person may * * *” or “a person may not * * *” mean that no person is required, authorized, or permitted to do the act prescribed; and\n(3) Includes means “includes but is not limited to”.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER A—DEFINITIONS AND GENERAL REQUIREMENTS","PART 1—DEFINITIONS AND ABBREVIATIONS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"e5350eb37a23397895fca669d8587031a7bd816e15e83e6c9cb7290d15a769a5","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-1.2","next":"us/14-cfr-3.1"},"notice":"GroundRules: Original legal text. Not legal advice."}