A1
the number 1
Dictionary examples:
One minute late? No ice cream! (0.0)
One pencil, five students. Time to share! (0.0)
One banana for ten people? Oops! (0.0)
You have three bags and I only have one. (10.0)
one hundred and ninety-one people (15.8)
Paint one side, leave it to dry, and then paint the other. (16.0)
Four packages came this morning, but only one was for Mark. (29.2)