Wiktionary (0.00 / 0 votes) Rate this definition: antiphonal (Noun). A book of antiphons or anthems sung or chanted at a liturgy; an antiphonary or antiphoner. antiphonal (Noun). An antiphon; a piece sung or chanted in an antiphonal manner. antiphonal (Adjective). Characterized by antiphones or antiphony; incorporating alternate, or responsive singing by a choir split into two parts. The antiphonal hymn was sung regularly at church.