# What does radiation power mean?

I would like to ask you what it means when it is written that a transmitter has 10 dBm power.

Does that mean that 10 dBm is provided to the antenna, or that 10 dBm is measured at particular frequency at the receiving side?

This means that the transmitter output power (to the antenna) is 10 dBm (which is $10^{1.0}\, \rm{mW} = 10\, \rm{mW}$).