Combat zone means
Date of admission to or date of entry into the United States means the date established by the U.S. Citizenship and Immigration Services as the date the alien is admitted for permanent residence.
Dependent means the same thing as it does for Federal income tax purposes-we mean someone for whom you are entitled to take a deduction on your personal income tax return. Exception: An alien and an alien's spouse are not considered to be dependents of the alien's sponsor for the purposes of these rules.
Essential person means someone who was identified as essential to your welfare under a State program that preceded the SSI program. (See §§ 416.220 through 416.223 for the rules on essential persons.)
Ineligible child means your natural child or adopted child, or the natural or adopted child of your spouse, or the natural or adopted child of your parent or of your parent's spouse (as the term child is defined in § 416.1101 and the term spouse is defined in § 416.1806 ), who lives in the same household with you, and is not eligible for SSI benefits.
Ineligible parent means a natural or adoptive parent, or the spouse (as defined in § 416.1101 ) of a natural or adoptive parent, who lives with you and is not eligible for SSI benefits. The income of ineligible parents affects your benefit only if you are a child under age 18.
Ineligible spouse means someone who lives with you as your husband or wife and is not eligible for SSI benefits.
Sponsor means an individual (but not an organization such as the congregation of a church or a service club, or an employer who only guarantees employment for an alien upon entry but does not sign an affadavit of support) who signs an affidavit of support agreeing to support you as a condition of your admission as an alien for permanent residence in the United States.
20 C.F.R. §416.1160