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I�ve never even heard of velocious before now (apart from a company name), so doubt whether many even use this word in everyday conversation. My copy of the Australian National Dictionary, which has 200,000 definitions, does not include it. Nor do most online dictionaries I use. So, my recommendation is to not use it unless you want to draw a big blank stare.
Even so, I would say that there is no adjective form of "velocity". To me it is kind of like asking "What is the adjective form of panda bear?" (comparing apples and oranges).
Velocity does not necessarily refer to being fast, it can also refer to how slow something is. So, "fast" or "swift" doesn �t fully encompass the meaning of velocity.
Yes, �velocious � is an archaism (although it does mean �rapid � or �swift �), but if Hamidou is simply looking to use �velocity � to modify another noun, there �s no problem as long as it �s in the attributive position: velocity pressure etc. It can �t be used in the predicative (we can �t say pressure is velocity).
Thank you all dear colleague. I appreciate all your answers. I asked the question because I personally have never hear about an adjective from the word.