parliamentary

Etymology

parliament + -ary

adj

1. Of, relating to, or enacted by a parliament
   Parliamentary procedures are sometimes slow.
2. Having the supreme executive and legislative power resting with a cabinet of ministers chosen from, and responsible to a parliament.
   The UK is a parliamentary democracy.
3. (Britain, historical, railways) Of a class of train which, by an act of parliament, ran both ways along a line, at least once each day, at the rate of one penny per mile.
   The train was moving less fast through the summer night. The swift express had changed into something almost a parliamentary, had stopped three times since Norwich, and now, at long last, was approaching Banton. 1931, Francis Beeding, “1/1”, in Death Walks in Eastrepps

noun

1. (UK, historical) A parliamentary train.