Another word for flatness

The flatness of faces of stone or rock (both granite and limestone) was tested by placing a true-plane trial plate, smeared with red ochre, against the dressed surface, as in modern engineer.

The error of flatness of the joints from a straight line and a true square is but thth in.

above sea-level, the general flatness being only broken by a small chain of hills, running in a north-westerly direction between Amraoti and Chandor, with an average height from 400 to 500 ft.

In or near Iioo B.C., Chou Kung, an able mathematician, determined with surprising accuracy the obliquity of the ecliptic; but his attempts to estimate the sun's distance failed hopelessly as being grounded on belief in the flatness of the earth.

The flatness impedes drainage which results in the compost staying too wet.