(military) A movement on foot by soldiers or prisoners of war, who must, in order to satisfy a military requirement, travel at a speed or in adverse conditions that would normally tire them excessively.

(military) In certain nations the highest military rank, ranking below only the commander in chief; now essentially disused.

(US) A public official with police powers responsible for enforcing fire safety regulations, and sometimes, who also investigates suspicious fires.

(business) The buying and selling of goods through distribution channels other than those authorized or intended by the manufacturer or producer.

(US, informal) cohabitation, civil union / (US, informal) gay marriage

Any market in which carbon emissions trading takes place.

Any of the family Bibionidae of dark hairy flies. / Tipula hortulana (syn. Bibio hortulanus), now of family Tipulidae of crane flies.

The extra benefit received from a unit increase in the consumption of a good or service. It is calculated as the increase in total benefit divided by the increase in consumption.

(economics) The increase in cost that accompanies a unit increase in output; the partial derivative of the cost function with respect to output.

(music) A mark placed on the score by the composer describing at what speed the passage should be played.