rotunda

As a noun rotunda

is a round building, usually small, often with a dome.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between concourse and rotunda

is that concourse is a large open space in or in front of a building where people can gather, particularly one joining various paths, as in a rail station or airport terminal while rotunda is a round building, usually small, often with a dome.

As nouns the difference between rotunda and rotundas

is that rotunda is a round building, usually small, often with a dome while rotundas is .

As nouns the difference between circular and rotunda

is that circular is a printed advertisement, directive, or notice intended for mass distribution; a flyer while rotunda is a round building, usually small, often with a dome.

As an adjective circular

is of or relating to a circle.

As nouns the difference between rotunda and arcade

is that rotunda is a round building, usually small, often with a dome while arcade is (architecture) a row of arches.

As nouns the difference between rotunda and atrium

is that rotunda is a round building, usually small, often with a dome while atrium is a central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.

As nouns the difference between rotunda and edifice

is that rotunda is a round building, usually small, often with a dome while edifice is building, structure.

As nouns the difference between turret and rotunda

is that turret is a little tower, frequently a merely ornamental structure at one of the corners of a building or castle while rotunda is a round building, usually small, often with a dome.