zhǔn
accurate
Original meaning:
water-level
Phonosemantic compound. 氵 represents the meaning and 隼 represents the sound. Based on the original meaning "water-level", a tool to check the flatness of surfaces. The meaning later shifted to "accurate", "rule", and "approve".
Components
Evolution

Seal script
Shuowen (~100 AD)
Seal script
Western Han dynasty (202 BC-9 AD)Regular script
ModernDefinitions
Sources