Capable of being done, achieved, or occurring. It is possible to finish the project by the end of the week if we work overtime.
That may be true or may be the case, as opposed to being certain or definite. It's possible that it might rain later, so we should take an umbrella just in case.
Having potential or capacity for development or future success. She is a possible candidate for the promotion due to her excellent performance.
Used after expressions like "as … as" to denote the greatest achievable degree or extent. Try to arrive as early as possible so we can start on time.