To make available for use; provide. To furnish or equip with: supplied sheets for every bed. To fill sufficiently; satisfy: supply a need. To make up for (a deficiency, for example); compensate for. To serve temporarily as a substitute in (a church, for example). To fill a position as a substitute. The act of supplying. Something that is or can be supplied. An amount available or sufficient for a given use; stock. Materials or provisions stored and dispensed when needed. Often used in the plural. Economics The amount of a commodity available for meeting a demand or for purchase at a given price. A cleric serving as a substitute or temporary pastor.