Let's eat lunch outdoors today.
The open-air concert was canceled due to rain.
Refers to open land, fields, or the outskirts of a town, often implying a natural or less-developed area. Less common than the 'outdoors' sense.
He left the city and started farming in the fields.
We decided to hold the wedding outdoors.
We enjoyed a barbecue outdoors with the family.
When we left the city and went out into the open country, quiet nature spread before us.
field research; field survey; field investigation
public exhibitionism; indecent exposure outdoors