I bought a second-hand car.

I got this information second hand, so I may be wrong.

In English grammar, 'you' is typically used as the pronoun for the second-person perspective.

She went on vacation to get her second wind.

The second-story man broke into the house through the window.

The centimeter-gram-second (cgs) system is a unit system commonly used in physics.

I played a thirty-second note on the piano.

The speed of light is measured in meter-kilogram-second units.

The second last line of the poem was the most impactful.

The petty officer second class is responsible for training and supervising junior enlisted personnel.