ˈplāgəl adjective
Etymology: Medieval Latin plagalis, from plaga plagal mode (probably back-formation, from plagius plagal, from Middle Greek plagios, from Greek, oblique, sideways, crooked, from plagos side) + Latin -alis -al; akin to Greek pelagos surface of the sea, sea, Latin plaga covering, net, region — more at flake
1. of an ecclesiastical mode or melody : having the keynote on the 4th scale step — distinguished from authentic
2. of a cadence : having a concluding chord sequence consisting of the subdominant chord and its resolution to the tonic — see cadence illustration