sebességétl
Sebességétl is not an established term in physics, engineering, or Hungarian language references. It appears to be either a misspelling, a nonce coinage, or a fictional/experimental label without a widely accepted definition. The word resembles Hungarian morphology, since sebesség means speed, but the ending in sebességétl is not a standard Hungarian suffix, and no authoritative source offers a fixed meaning for the term.
Because no accepted definition exists, readers are most likely to encounter sebességétl in one of several ways.
In the absence of a canonical meaning, any discussion of sebességétl should specify how the term is