Without wrinkles.

a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft.

(of a gear) To continue spinning after disengagement. / (of a cyclist) To ride a bicycle without pedalling, e.g. downhill.

An incident, especially one that is harmful, occurring under highly unusual and unlikely circumstances.

The Helmholtz free energy, A (the internal energy of a system minus the product of its entropy and absolute temperature)

(physics, chemistry, thermodynamics) The difference between the enthalpy of a system and the product of its entropy and absolute temperature: a measure of the useful work obtainable from a thermodynamic system at constant temperature and pressure.

plural of freak accident

(of a road or highway) Free to use; not requiring payment of a toll to use. / (US, of a phone call) Without an additional toll, especially for a long-distance charge.

Alternative form of freefall

An area within a port where goods may be temporarily stored without paying duty