An admission against interest is as an out-of-court statement made by a party that is against their own pecuniary, proprietary, or penal interest, and that is admissible under both an exclusion (admission by a party-opponent) and an exception (statement against interest) to the rule against hearsay. Such a statement is admissible even if the declarant is available, because an admission by a party-opponent is non-hearsay and, thus, does not require unavailability.
See also: Admission, Admission of guilt, Admit, Declaration against interest, Hearsay, Hearsay Rule, Federal Rules of Evidence Rule 801(d)(2) and 804(b)(3)
[Last updated in February of 2022 by the Wex Definitions Team]