Used when referring to activities in natural settings, often for leisure or exercise. They planned to picnic out of doors this weekend.
Pro Tip 2/3
No Enclosure
Emphasizes being in an open space without walls or a ceiling, like in a park or garden. The children love playing out of doors, especially in the summertime.
Pro Tip 3/3
Fresh Air
Suggests a refreshing or healthful quality associated with being outside of confined spaces. After being ill for weeks, he finally felt well enough to walk out of doors.