## AI Etymology
Fleetingness comes from fleeting (present participle of fleet, from Old English flēotan 'to glide') + the noun-forming suffix -ness. Morphologically, the form is compositional, with the named elements combining to produce the modern spelling and sense. In present use, it is used as a noun meaning "the quality of passing quickly; transitoriness", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes related forms such as fleet, fleeting, and fleetingly, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Old English flēotan, keeping the history tied to concrete forms rather than a loose resemblance. Its semantic neighborhood is marked by transience, ephemerality, impermanence, and brevity on one side and contrasts such as permanence, durability, and perpetuity on the other, locating the modern specialization without adding a new origin story.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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