(physics) Dilute or disorganized energy, which cannot be transformed into work. / (pathology) Deficiency of energy. / (immunology) Lack of immunity to an antigen.

An ancient ruin on a hilltop overlooking the Valley of Elah, straddling the Green Line between Israel and the West Bank.

(astronomy) The real or apparent motion of a star etc. through space.

Third-person singular simple present indicative form of unencumber