To bring (something) into contact with the air, so as to freshen or dry it. / To let fresh air into a room or a building, to ventilate. / To discuss varying viewpoints on a given topic.

(philosophy) The principle that, if two objects are indistinguishable from one another with respect to all of their properties, then they are identical.

assigned for some purpose. / taken out of agricultural production / reserved or booked in advance

(biochemistry) That breaks down starch into maltose.