noun
sense of relief; feeling of relief
A straightforward noun for the emotion of relief, often used when a worry or tension is resolved.
試験が終わって、安堵感でいっぱいだ。
Now that the exam is over, I'm filled with a sense of relief.
無事を知らせる電話に、安堵感を覚えた。
I felt relief at the phone call telling me they were safe.
安堵 is the base noun meaning relief, but 安堵感 explicitly adds 感 (feeling) to emphasize the subjective emotional experience.
Compound of 安堵 (relief, from 安 'peace' and 堵 'fence, barrier', originally meaning to be at ease within one's domain) and 感 (feeling, sensation).