OPEN a.
al parts, together with the under side of the covering, or its lining, are treated ornamentally, and left to form the ceiling of an apartment below, as in a church, a public hall, and the like. -- Open vowel or consonant. See Open, a., 9.
PENETRATION n.
The act or process of penetrating, piercing, or entering; also, the act of mentally penetrating into, or comprehending, anything difficult. And to each in ward part, With gentle penetration, though unseen, Shoots invisible virtue even to the deep. Milton. A penetration into the difficulties of algebra. Watts.…
PLATFORM n.
one that is raised above some particular level, as a framework of timber or boards horizontally joined so as to form a roof, or a raised floor, or portion of a floor; a landing; a dais; a stage, for speakers, performers, or workmen; a standing place.