The word 'temple' carries a history of sacred demarcation. It traces back to Latin 'templum', which referred not just to a building but to a space ritually cut out from the mundane world for observation of omens or worship. This concept stems from the Proto-Indo-European root tem-, "to cut," highlighting the original act of defining a holy boundary. Over time, the meaning narrowed to focus on the building itself within that sacred space. The anatomical sense, referring to the flattened area of the head, emerged in the 14th century, likely from the resemblance of this part of the skull to a stretched, thin surface, metaphorically a "stretched" or "cleared" area.

The word 'temple' is a simplex word. It entered English from Old French 'temple', which derived from Latin 'templum', meaning a consecrated or sacred space, especially one marked out for augury. The Latin term likely originates from the Proto-Indo-European root tem- meaning "to cut" or "to demarcate," reflecting the ancient practice of ritually marking out a sacred precinct.