To represent in words.
To give rise to a geometrical structure.
To introduce a new taxon to science by explaining its characteristics and particularly how it differs from other taxa.
To represent by drawing; to draw a plan of; to delineate; to trace or mark out.
To keep (information, assent etc) to oneself rather than revealing it.
To stay back.
To keep (a physical object that one has obtained) to oneself rather than giving it back to its owner.