Fixed (fĭkst), a. 1. Securely placed or fastened; settled; established; firm; imovable; unalterable.
2. (Chem.) Stable; non-volatile.
Fixed air(Old Chem.), carbonic acid or carbon dioxide; — so called by Dr. Black because it can be absorbed or fixed by strong bases. See Carbonic acid, under Carbonic. — Fixed alkali(Old Chem.), a non-volatile base, as soda, or potash, in distinction from the volatile alkali ammonia. — Fixed ammunition(Mil.), a projectile and powder inclosed together in a case ready for loading. — Fixed battery(Mil.), a battery which contains heavy guns and mortars intended to remain stationary; — distinguished from movable battery. — Fixed bodies, those which can not be volatilized or separated by a common menstruum, without great difficulty, as gold, platinum, lime, etc. — Fixed capital. See the Note under Capital, n., 4. — Fixed fact, a well established fact. — Fixed light, one which emits constant beams; — distinguished from a flashing, revolving, or intermittent light. — Fixed oils(Chem.), non-volatile, oily substances, as stearine and olein, which leave a permanent greasy stain, and which can not be distilled unchanged; — distinguished from volatile or essential oils. — Fixed pivot(Mil.), the fixed point about which any line of troops wheels. — Fixed stars(Astron.), such stars as always retain nearly the same apparent position and distance with respect to each other, thus distinguished from planets and comets.