salutation
A gesture or utterance used as a greeting. / The greeting used in a letter or email, such as Dear Mr. Smith.
Noun
pl: salutations
This term carries a formal and structured connotation, often evoking a sense of protocol, etiquette, or military discipline. It describes the ritualized opening of an interaction, whether through a physical gesture like a salute or a written phrase. While a greeting is casual and universal, a salutation implies a specific adherence to social or professional standards.
In written correspondence, the word refers specifically to the opening line. It functions as a social signal that establishes the relationship between the sender and the recipient, ranging from the stiff formality of official government documents to the polished professionalism of corporate emails.