qì
air
Original meaning:
gift of grain
Phonosemantic compound. 米 represents the meaning and 气 represents the sound. Based on the original meaning "gift of grain", now written as 餼. The current meaning "air" is a phonetic loan.
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Cao Wei (Three Kingdoms: 222-280 AD)Regular script
ModernDefinitions
Sources