She completed her secondary education last year.

Secondary immunodeficiency can occur as a result of certain medical conditions or treatments.

The sec'y is in a meeting.

Security by design is an approach to software development that prioritizes security from the beginning.

The security camera captured the thief in action.

In some countries, second-class citizens are denied basic rights and opportunities.

In object-oriented programming, a second-class value is a value that can be stored in a variable, passed as an argument, or returned from a function.

In this society, women are often treated as second-class objects.

Second-class entities are often overlooked in society.

In the world of programming, JavaScript used to be considered a second-class entity.