Definition of plene:
(adj) :
(chiefly of abjad script) Written with matres lectionis (letters indicating vowels).
(adv) :
(chiefly of abjad script) With matres lectionis (letters indicating vowels) written out.
(n) :
(chiefly of abjad script) A word written with matres lectionis (letters indicating vowels).
(adj) :
(obsolete) Full, complete, whole.