introdujese
Introdujese is a verb form in Spanish that corresponds to the imperfect subjunctive mood of the verb introducir. It is primarily encountered in formal, literary, or historical texts and in some regional usages. When used with the reflexive pronoun se, as in se introdujese, the construction can express a hypothetical or subjunctive self-directed action, such as “that he introduced himself.” The form is not common in contemporary everyday speech, where other subjunctive or reflexive forms are more typical.
Morphologically, introdujese derives from the stem introduj- (the preterite stem of introducir) plus the imperfect subjunctive
Usage in modern Spanish tends to favor the -iera forms (introdujera) in the imperfect subjunctive, with introdujese
See also: Spanish verb conjugation, imperfect subjunctive, introducir, se (pronoun), subjunctive mood.