Ablation is defined as the removal of material from the surface of an object by vaporization, chipping, or other erosive processes. The term occurs in space physics associated with atmospheric reentry, in glaciology, medicine and passive fire protection.In space vehicle design, ablation is used to both cool and protect mechanical parts and/or payloads that would otherwise be adversely affected by extremely high temperatures.
In a basic sense, ablative material is designed to slowly burn away in a controlled manner, so that heat can be carried away from the spacecraft by the gases generated by the ablative process...
Where does this come from?
In Latin, ablatives modify or limit nouns by ideas of where (place), when (time), how (manner), etc.
Ablative of Separation
A closely related construction is called the ablative of separation. This usage of the ablative implies that some person or thing is separated from another. No active movement from one location to the next occurs; furthermore, ablatives of separation sometimes lack a preposition, particularly with certain verbs like cáreō or līberō. E.g. Cicerō hostēs ab urbe prohibuit, "Cicero kept the enemy away from the city"; Eōs timōre līberāvit, "He freed them from fear."