(physics) The ratio of the RMS value to the absolute mean of a sinusoidal wave (especially to that of an alternating current)

plural of factor market

In management accounting, a constraint that limits the business from achieving a higher level of profitability.

(military, slang) The level of stress and/or adrenaline in a dangerous situation.

An antigen of the Rhesus system; understood unless otherwise specified to refer to Rhesus factor D (RhD), which appears on the surface of the red blood cells of most (85%) humans. An incompatibility between the Rh-blood types of a mother and her baby may cause serious disease for the baby.

(idiomatic) An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences. / (idiomatic) A special talent, ability or quality or its indefinable cause.

(electrical, engineering) The ratio of the actual power to the apparent power in an alternating current power system; specifically, the cosine of the phase angle between the voltage and the current.

(engineering) The ratio of the maximum stress or load which something can withstand to the stress or load which it was designed to withstand under normal operation.

(Britain) A trader in grains.

(medicine, biochemistry) Any of several polypeptide hormones, produced by macrophages, that can destroy some cancer cells.