πλήρωμα
plḗrōma
play'-ro-mah
from πληρόω; repletion or completion, i.e. (subjectively) what fills (as contents, supplement, copiousness, multitude), or (objectively) what is filled (as container, performance, period).

KJV translates as: which is put in to fill up, piece that filled up, fulfilling, full, fulness