prostration

1. 1. The act of prostrating oneself.
   2. The state of being prostrate.
2. Total exhaustion or weakness; collapse.

Total exhaustion or weakness; collapse.

Extreme exhaustion, or lack of energy or power.

• heat p. — a condition caused by exposure to excessive heat. See also heat1 exhaustion.

The noun has 3 meanings:

Meaning #1: a condition marked by dizziness and nausea and weakness caused by depletion of body fluids and electrolytes
  Synonyms: heat exhaustion, heat prostration

Meaning #2: abject submission; the emotional equivalent of prostrating your body

Meaning #3: the act of assuming a prostrate position