Supply is a flow concept. It refers to the quantity of a good or service that a producer is willing and able to offer for sale. This willingness to supply is always defined with respect to two key elements:
Price: The quantity a producer is willing to supply depends directly on the price they can receive.
A time period: Supply must be expressed over a specific period (e.g., per day, per week, per year).
Therefore, supply is meaningless without reference to both a price and a time period.