The word "alone" means being by oneself or without others in a particular place, situation or time. It can also mean isolated from other people or things, or existing as the only one of its kind.
Usage examples
I prefer to study alone at the library.
She decided to travel alone to the beach.
He often goes for long walks alone in the park.
The dog was left alone in the house for hours.
The child felt lonely and cried because they were alone at home.
She found solace in books as she spent a lot of time alone.
It's nice to have some alone time after a long day at work.
The team worked together on the project, but he completed his part alone.
They enjoyed a peaceful evening alone in their cozy cabin.
The astronaut spent months alone on the International Space Station.
I must admit I was surprised to see it wasn't number 1 on your list, let alone not on your list at all. (nintendotoday.com)
So at least we weren't alone in leaving behind a trail of possessions. (multiplesandmore.com)
Only a few years ago, unemployment rates like this would have been seen as a good outcome in strong times, let alone in times of economic weakness. (rba.gov.au)