air temperature, atmospheric temperature, ambient temperature

valuable, worthful, precious

strategic

one's herald, an official messenger in uniform / an emissary, a special envoy

vibration bath, a bath charged with an electric current strong enough to stimulate muscles and create a tingling sensation but low enough to be safe for healthy people

hammock (swinging couch or bed)

systematic

time limit, deadline, cutoff / time frame

tape measure

convex