(uncountable, optics) Interference of light caused by its reflection from both boundaries of a thin film of a transparent material. / (countable, optics) An instance of this interference.

(law) Actual knowledge of copyright infringement, which may mean that an online service provider bears more liability for its users' actions than if it had no such knowledge.

(idiomatic) Without any other formalities; with no further delay.

(especially representing drunken or slurred speech) Contraction of with you.