每秒 (měi miǎo) literally means 'each second' and functions as a unit of measurement indicating frequency or rate — equivalent to 'per second' in English. The character 每 means 'each' or 'every', emphasizing recurrence, while 秒 means 'second' (the base unit of time). Together, they form a compound that quantifies how many times something occurs, moves, or changes within one second.

This term is commonly used in scientific, technical, and everyday contexts involving speed, data transfer, heart rate, or motion — for example, describing how fast a car accelerates, how many frames a camera captures, or how many times the heart beats. It typically follows a number or quantity and precedes a verb or noun (e.g., 60 每秒 → '60 per second'), though in natural speech it often appears post-nominally after the measured quantity (e.g., 米每秒). It’s not used alone; it always modifies a measurable action or unit.