A (indefinite article)

  1. Used when referring to someone or something for the first time in a text or conversation.
  2. Used to indicate membership of a class of people or things.

Origin:

Old english ān, from germanic *ainaz, from an indo-european root shared by greek oinos 'ace' and latin unus 'one'.

Examples:

  1. A dog barked outside.
  2. She is a teacher at the local school.
  3. A laptop is on the desk.
  4. He wants to be a doctor when he grows up.
  5. I found a penny on the ground.
Some random words: transact, hardheaded, stow