conventional

Etymology

convention + -al

adj

1. Pertaining to a convention, as in following generally accepted principles, methods and behaviour.
   A “moving platform” scheme[…]is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays. 2013-06-01, “Ideas coming down the track”, in The Economist, volume 407, number 8838, page 13 (Technology Quarterly)
2. Ordinary, commonplace.
   They wear conventional clothes, eat conventional food, and keep conventional hours.
   Mother[…]considered that the exclusiveness of Peter's circle was due not to its distinction, but to the fact that it was an inner Babylon of prodigality and whoredom, from which every Kensingtonian held aloof, except on the conventional tip-and-run excursions in pursuit of shopping, tea and theatres. 1922, Ben Travers, chapter 2, in A Cuckoo in the Nest
   The history of our study of our solar system shows us clearly that accepted and conventional ideas are often wrong, and that fundamental insights can arise from the most unexpected sources. 1980, Carl Sagan, Cosmos: A Personal Voyage
3. Banal, trite, hackneyed, unoriginal or clichéd.
4. (weaponry) Pertaining to a weapon which is not a weapon of mass destruction.
5. (agriculture) Making use of synthetic fertilizers and pesticides.
6. (bridge) In accordance with a bidding convention, as opposed to a natural bid.

noun

1. (finance) A conventional gilt-edged security, a kind of bond paying the holder a fixed cash payment (or coupon) every six months until maturity, at which point the holder receives the final payment and the return of the principal.