Unaccompanied alien child
Unaccompanied alien child (UAC) means:
(1) An individual who: Has no lawful immigration status in the United States; has not attained 18 years of age; and with respect to whom:
(i) There is no parent or legal guardian in the United States; or
(ii) No parent or legal guardian in the United States is available to provide care and physical custody.
(2) When an alien previously determined to have been a UAC has reached the age of 18, when a parent or legal guardian in the United States is available to provide care and physical custody for such an alien, or when such alien has obtained lawful immigration status, the alien is no longer a UAC. An alien who is no longer a UAC is not eligible to receive legal protections limited to UACs.