IPA: /ˌpɜːrspəˈreɪʃən/
KK: /pɜrˈspɪr eɪ ʃən/
The process of sweating, where the body releases a salty fluid through the skin to help cool down.
After running for an hour, I was covered in perspiration.
Perspiration → It is formed from "per-" (meaning through) and "spirare" (meaning to breathe). The word describes the process of breathing through the skin, which is how sweat is released from the body.
Think of 'breathing through' ('per-') the skin when you sweat — that's what perspiration means.