the verb "condition"

[Hanka]

Hi,

could you please explain the meaning of the verb "condition" in the following text:

The sample of the fabric was washed five times in accordance with standard XXX at 60°C and was dried in a tumble drier. After drying, the sample was conditioned and tested at 23 +/- 1 °C and 24 +/- 1 % r.h.

Thank you very much.

Hanka

[Tdol]

Could it be treated with something to improve the condition of it, like conditioned for hair?