45 C.F.R. § 1080.2 – Definitions.

(a) Homeless or homeless individual includes:
1. (1) An individual who lacks a fixed, regular, and adequate nighttime residence; and
2. (2) An individual who has a primary nighttime residence that is:
  1. (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);
  2. (ii) An institution that provides a temporary residence for individuals intended to be institutionalized; or
  3. (iii) A public or private place not designed for, or ordinarily used as, a regular sleeping accommodation for human beings.
    The term homeless or homeless individual does not include any individual imprisoned or otherwise detained pursuant to an Act of the Congress or a State law.
(b) Indian tribe means any tribe, band, nation, or other organized group or community of Indians, including any Alaska Native village or regional or village corporation (as defined in, or established pursuant to, the Alaska Native Claims Settlement Act), that is recognized by the Federal Government as eligible for special programs and services provided to Indians because of their status as Indians.
(c) State includes the 50 States, the District of Columbia, the Commonwealth of Puerto Rico, the Virgin Islands, Guam, American Samoa, the Commonwealth of the Northern Mariana Islands, and the Republic of Palau.