We rely on a 3rd-party vendor for payment processing.

We hired a 3rd party to audit the company's security procedures.

When they held hands at the cafe, we felt like 3rd wheels.

The 3rd grade enjoyed a field trip to the science museum.

Despite improving her speed, she kept 3rding in the championship races.

She 3rded in every race this season despite the rain.

3rdly, we should analyze the survey results before making a final decision.