one

pluralones

noun: the number 1
- I have one apple left.
pronoun: referring to a person or thing previously mentioned or easily identified
- If anyone calls, tell them I’m not home; I’ll call one back later.
adjective: used to indicate a particular but unspecified thing
- One day, I will travel the world.
noun: a single unit or entity
- They are a team, acting as one.
adverb: once or on a single occasion
- He has travelled to Japan one time in his life.
pronoun: used to refer to people in general
- One should save regularly for emergencies.
adjective: in agreement
- The board was of one mind about the plan.
noun: a person or thing considered first in rank, importance, or preference
- She remains the team's number one.