open

Able to have something pass through or along it.

Not covered, sealed, etc.; having an opening or aperture showing what is inside.

Not physically drawn together, folded or contracted.

Of a space, free of objects and obstructions.

Resulting from an incision, puncture or any other process by which the skin no longer protects an internal part of the body.

Unlocked or unlatched but not physically open.

In a position allowing fluid to flow.

Of a sandwich, etc.: composed of a single slice of bread with a topping.

Not of a quality to prevent communication, as by closing waterways, blocking roads, etc.; hence, not frosty or inclement; mild; used of the weather or the climate.

Available for use or operation.