Meanings

information on space availability in a parking lot (car park)

air guitar

empty (e.g. intermodal containers in the transport industry)

vacant rooms available

aviation fuel tax

discount airline ticket

space-time

vacant and unthinking

to have a good opportunity only to let it slip from your grasp

to read the situation

Weigela hortensis (species of deciduous shrub in the honeysuckle family)

blank email (e.g. for signing up to an email list)

air pump

Great Interregnum (period of the Holy Roman Empire; approx. 1254-1273)

air tank (scuba)

air sac

loss of equilibrium

one-way airline ticket

air-fuel ratio

virtual space (e.g. in computer graphics)