[{"Bold_text": "noun", "List Items": ["the system, especially a government postal system, of sending mail by airplane.", "a letter, package, etc., sent by this system.", "a stamp authorizing delivery of mail by this system."]}, {"Bold_text": "adjective", "List Items": ["of or relating to airmail."]}, {"Bold_text": "adverb", "List Items": ["by airmail:Send all overseas letters airmail."]}, {"Bold_text": "verb (used with object)", "List Items": ["to send via airmail:I airmailed the package yesterday."]}]