Definition of One-and-Done

The "one-and-done" rule in the NBA refers to college basketball players who play one year of college basketball before declaring their eligibility for the NBA draft.

Recent examples of "one-and-done" players include Zion Williamson and Deandre Ayton, who both played a year of college basketball before declaring for the NBA draft.

The current NBA Collective Bargaining Agreement states that no player can sign with an NBA team until they are 19 years of age or older.

The rules also state that a player can't make himself available for the NBA draft until one year after his high school graduation.

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The rules regarding the "one-and-done" are likely to change in the coming years.

There has been a movement to allow 18 year-olds to play in the NBA going forward, and this will likely be addressed in the next collective bargaining agreement.

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A number of Hall of Fame players, including Lebron James, Kobe Bryant and Kevin Garnett, elected to skip college entirely to enter straight into the NBA.

Under the NBA's current collective bargaining agreement, all three of these players would have had to have played a year in college first.