prealtitude
Prealtitude is a term that has seen limited use and does not have a widely accepted or standard definition within scientific or technical fields. Its meaning can be inferred from its etymological components: "pre-" meaning before, and "altitude" referring to height or elevation. Therefore, "prealtitude" could conceptually refer to a state, condition, or measurement that exists or is taken prior to achieving a certain altitude, or perhaps a baseline altitude from which further measurements are made.
In contexts where the term might appear, it could be used informally to describe the initial height