if somebody has a temper, they become angry very easily

She says awful things when she's in a temper.

He stormed out of the room in a temper.

to fly into a temper

She broke the plates in a fit of temper.

Some small children have terrible temper tantrums.

the way that you are feeling at a particular time

Come back when you're in a better temper.

to be in a bad/foul temper

to make something less severe by adding something that has the opposite effect

to make metal as hard as it needs to be by heating and then cooling it

The blade is hardened and tempered so that it resists damage.

LEARNit Dictionary