rapidity

Fetched 2026-10-26 (cache).

Synonyms: sapidity, vapidity, rabidity, rapacity, cupidity, avidity, validity, rigidity, rapidly, calidity, aridity

Antonyms: sapidity, vapidity, rabidity, rapacity, cupidity, avidity, validity, rigidity, rapidly, calidity, aridity

Related words from Datamuse; suggestions, not definitions.

Noun

1. [[speed]], [[swiftness]]; the condition of being [[rapid]]
2. {{lb|en|relativity}} A measure of [[velocity]] relative to the [[speed of light]]; defined as [[artanh]](v), where artanh is the hyperbolic arctangent, and v = speed (with c = speed of light = 1).
3. {{lb|en|physics}} A measure of the velocity of a [[particle]] in a [[beam]] relative to the beam's [[axis]]

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.