Extension: surface available in a single coordinate axis; on the abscissa axis determines a floor level where treads. In the axis of the Ordinance, it determines the wall of a wall to lead, perpendicular to the ground. Whole or particular area within the regular or irregular basis. Part of a table or shelf, on which other objects can be set. Series of tricks on a table, that way of keys, trigger way. mechanics-- soft: a piano keyboard
