having or showing appreciation or a favorable critical judgment or opinion; "appreciative of a beautiful landscape"; "an appreciative laugh from the audience"
feeling or expressive of gratitude; "was appreciative of his efforts"; "an appreciative word"
in or to a backstage area of a theater; "costumes were changed backstage"
out of view of the public; behind the scenes; "Working backstage to gain political support for his proposal"; "many private deals were made backstage at the convention"
being of crucial importance; "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions"- Henry Kissinger; "the polar events of this study"; "a polar principal"
impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"