The Greek adjective diplous (G1362) means double or twofold. In the New Testament it carries ethical weight — both positive (double honor for faithful elders) and negative (Babylon's double punishment in Revelation).
Diplous reflects the biblical principle of proportional recompense. Elders who lead well deserve 'double honor' (1 Timothy 5:17). In Revelation 18:6, Babylon receives 'double' for her sins — the punishment fitting the depth of her corruption. This principle of doubling runs through biblical justice: God repays in kind, multiplied. The same measure used against others will be used against us (Matthew 7:2).