We also suggested that each event be limited to a single subject.

This can be a strength, as Q is sometimes used with a single subject.

Don't allow the camera to stay on a single subject for more than 15 seconds.

English as a second language is the single most popular subject in the world, after mathematics.

"We haven't said we're an authority on a single subject."

Every one of these papers dealt with a single subject.

Each issue of the new magazine would focus on a single subject such as home design, travel, food or weddings.

Some of the new high schools will focus on a single subject, like technology or drama.

How can we understand the patient as a single subject?

The doctor should be a single subject as well.