A state of being absent or withdrawn from a place or from companionship; -- opposed to presence., Want; destitution; withdrawal., Inattention to things present; abstraction (of mind); as, absence of mind.
Aplasia is the medical term meaning absence of development.
Asplenia is the medical term meaning absence of the spleen.
Athelia means absence of a nipple.
presence
Athelia is the medical term meaning absence of nipples.
Aphakia is the medical term meaning absence of the lens. This is often a result of cataract surgery.
Anhydrosis or anhidrosis, either spelling, is the medical term meaning an abnormal condition of an absence of sweat or perspiration.
Absence is simply defined as "Not being there."
arrhythmia
The medical term for absence of the external ear is "anotia." This condition involves complete absence of the external ear.
According to internetslang.com, it means "leave of absence". :)
anhydrous