In science, the word "current" refers to the flow of a medium. The specific definition depends on the context:
Definition (Electricity)
Current is the rate of flow of electricity. The unit of current is the ampere (A) which is defined as 1 ampere = 1 coulomb per second.
Definition (Fluid)
Current is the flow of a fluid, such as a gas or liquid. Air currents refer to air, while ocean currents and rip currents refer to water. A typical unit is meters per second (m/s).
Definition (Quantum Mechanics)
In physics, a current may refer to a probability current, which is also called a probability flux. This is a quantity that described the probability of flow in terms of unit time per unit area.