1. In a comfortable, relaxed state; not anxious or tense
She felt at ease in her new home after a few weeks.
Ela se sentiu à vontade em sua nova casa após algumas semanas.
2. In a military context, a relaxed standing position with feet apart (opposite of 'at attention')
The sergeant ordered the soldiers to stand at ease.
O sargento ordenou aos soldados que ficassem à vontade.