Another word for a-one

They probably had a lot to discuss and most likely were not alone.

For a moment she felt the dull aching pain of being utterly alone.

She had always been a recluse at heart, often declining a social outing with her friends so that she could be alone with a book or her writing.

Sarah made an excuse of putting Tammy down for a nap and left them alone.

It was only a ruse to get her alone.