tài
very
Addition of a dot to 大 (dà; big) to mean "very" or "extremely".
Evolution

Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources
季旭昇《說文新證》p.800
tài
very
Addition of a dot to 大 (dà; big) to mean "very" or "extremely".
Seal script
Shuowen (~100 AD)Clerical script
Eastern Han dynasty (25-220 AD)Regular script
Modern季旭昇《說文新證》p.800