(soccer) a free kick from which a goal may be scored directly

(law, informal) the concept that a dog is not considered dangerous until it has bitten someone.

Able to do as one pleases, unconstrained by social ties or responsibilities.

non-esterified fatty acid

(physics, thermodynamics) A measure of the useful work obtainable from a constant temperature, constant volume thermodynamic system; more precisely, the difference between internal energy (of a system) and the product of its absolute temperature and entropy.

(computing theory) A formal grammar in which every production rule is such that the left-hand side is exactly one non-terminal symbol and the right-hand side is zero or more terminal symbols and/or nonterminal symbols.

(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.

(US) The president of the United States.

(Incoterm) Describing a situation in which the seller pays for transportation to the port, and the buyer pays for the rest of the transportation.

Nothing is free; even things that appear free often have to be paid in the end.