1. The act of clearly and directly communicating that one is available or ready to do something
She sent an email to express availability for the meeting tomorrow.
Ela enviou um e-mail para expressar disponibilidade para a reunião de amanhã.
2. Explicitly stating or making known one's readiness to help, participate, or be present
He wanted to express availability to volunteer for the project.
Ele queria expressar disponibilidade para se voluntariar no projeto.