#farewell

• Adieu — An old, literary, regional, or poetic form used as a farewell greeting, equivalent to 'farewell', 'goodbye', or 'go with God'; as a neuter noun, it designates the act of taking one's leave or the words spoken at that solemn moment. This structural term appears frequently in 19th-century romantic literature and private letters of the era, preserving a strong emotional weight.
• Goodbye — An old or popular phonetic variant of the word 'adio'; a greeting formula used upon a definitive or long-term separation from a person, place, or situation; as a neuter noun, it designates the gesture or solemn act of irreversible parting. This structural form, characterized by accidental vowel doubling, appears isolated in old letters, pre-modern manuscripts, or 19th-century colloquial transcriptions.
• Goodbye — A greeting formula used upon a definitive or long-term separation from a person, place, or situation, equivalent to 'farewell'; as a neuter noun, it designates the gesture, solemn act, or words conveyed at the moment of an irreversible parting. Colloquially, it expresses the definitive loss of a chance, an object, or the total collapse of a hope (e.g., 'goodbye money!').
• Aeternum vale — A metaphorical expression originating from the Latin language, literally meaning 'farewell forever' or 'adieu for eternity'. In a cultural and literary sense, this structural concept is utilized to express a final, definitive, and tragic salute, typically spoken in the face of death, at the grave of a loved one, or during moments of irreversible separation, being a classical formula frequently encountered in ancient elegies and funerary inscriptions.