A second-countable manifold has many convenient properties, such as separability and metrizability under certain conditions.

When I was in second grade, I learned how to ride a bicycle without training wheels.

The team changed strategy in the second half and came back to win.

She bought a cosmetic second at the factory outlet because it was a manufacturer-made item with only a minor blemish and therefore offered at a lower price.

The twenty-second stepped forward to accept the prize.

The twenty-second chapter of the book revealed a surprising twist.

During the 1950s and 1960s, cultural exchanges between the Second World and non-aligned nations were often overshadowed by ideological rivalry.

At the theater, every second seat was left empty to ensure distance between audience members.

The sensor recorded a temperature reading every second for the duration of the experiment.

I cherished every second of the vacation, aware that the entire duration was fleeting.