subjunctivity
/ˌsʌbdʒʌŋ(k)ˈtɪvɪti/noun
1 Grammar. The quality of being subjunctive; expression of that which is prospective, contingent, or hypothetical; the subjunctive mood.
2Chiefly Literary Criticism. The relationship between something proposed or portrayed (especially in science fiction) and reality; degree of realism or probability.
Origin
Mid 19th century. From subjunctive + -ity.