Homeless person. A youth (17 years or younger) not accompanied by an adult (18 years or older) or an adult without children, who is homeless (not imprisoned or otherwise detained pursuant to an Act of Congress or a State law), including the following:
(1) An individual who lacks a fixed, regular, and adequate nighttime residence; and
(2) An individual who has a primary nighttime residence that is:
(i) A supervised publicly or privately operated shelter designed to provide temporary living accommodations (including welfare hotels, congregate shelters, and transitional housing for the mentally ill);
(ii) An institution that provides a temporary residence for individuals intended to be institutionalized; or
(iii) A public or private place not designed for, or ordinarily used as, a regular sleeping accommodation for human beings.