What is the meaning of Pneumatic?

Of, relating to, or resembling air or other gases

Of or relating to pneumatics

Powered by, or filled with, compressed air

Having cavities filled with air

Spiritual; of or relating to the pneuma

well-rounded; full-breasted; bouncy

A vehicle, such as a bicycle, whose wheels are fitted with pneumatic tyres.

In the gnostic theologian Valentinus' triadic grouping of man, the highest type; a person focused on spiritual reality (the other two being hylic and psychic).

pneumatic

Source: wiktionary.org