Question

oscillation means :
the act of adapting something to meet a standard
the act of cutting into an edge with toothlike notches
a stable situation in which forces cancel each other
a complete execution of a periodically repeated phenomenon

Explanation:

Oscillation refers to a periodically - repeating phenomenon. For example, a pendulum's back - and - forth movement is an oscillation. It is the complete execution of such a repeated motion.

Answer:

D. a complete execution of a periodically repeated phenomenon