ETYMOLOGY
from Latin obligatorius (imposing obligation) + -ous
EXAMPLE
“… quharethrow he culd nocht contract, trespas, or do ony sic deid as were obligatorious, quherbj he mycht be oblist to pvnisment of his persoune, likeas he mycht nocht oblise him in his gudis …”
From: Ancient Criminal Trials in Scotland
Compiled from the original records and manuscripts
By Robert Pitcairn, 1833
Slaughter committed by an alleged Madman or Furious person – A.D. 1554
Lexicophilia 