26 CFR § 1.151-3 - Definitions.
(a) Child. For purposes of sections 151(e), 152, and the regulations thereunder, the term “child” means a son, stepson, daughter, stepdaughter, adopted son, adopted daughter, or for taxable years beginning after December 31, 1958, a child who is a member of an individual's household if the child was placed with the individual by an authorized placement agency for legal adoption pursuant to a formal application filed by the individual with the agency (see paragraph (c)(2) of § 1.152–2), or, for taxable years beginning after December 31, 1969, a foster child (if such foster child satisfies the requirements set forth in paragraph (b) of § 1.152–1 with respect to the taxpayer) of the taxpayer.
(b) Student. For purposes of section 151(e) and section 152(d), and the regulations thereunder, the term “student” means an individual who during each of 5 calendar months during the calendar year in which the taxable year of the taxpayer begins is a full-time student at an educational institution or is pursuing a full-time course of institutional on-farm training under the supervision of an accredited agent of an educational institution or of a State or political subdivision of a State. An example of “institutional on-farm training” is that authorized by 38 U.S.C. 1652 (formerly section 252 of the Veterans' Readjustment Assistance Act of 1952), as described in section 252 of such act. A full-time student is one who is enrolled for some part of 5 calendar months for the number of hours or courses which is considered to be full-time attendance. The 5 calendar months need not be consecutive. School attendance exclusively at night does not constitute full-time attendance. However, full-time attendance at an educational institution may include some attendance at night in connection with a full-time course of study.
(c) Educational institution. For purposes of sections 151(e) and 152, and the regulations thereunder, the term “educational institution” means a school maintaining a regular faculty and established curriculum, and having an organized body of students in attendance. It includes primary and secondary schools, colleges, universities, normal schools, technical schools, mechanical schools, and similar institutions, but does not include noneducational institutions, on-the-job training, correspondence schools, night schools, and so forth.