All 6 Uses

convention
in
Life of Pi
(Edited)

In theory—that is, as a simple physical possibility—an animal could pick up and go, flaunting all the social conventions and boundaries proper to its species.
Chpt 1-4

conventions = normal behaviors
CITES, the Convention on International Trade in Endangered Species, had just come into effect, and the window on the trading of captured wild animals had slammed shut.
Chpt 33-36 *

convention = an international agreement
Still, that second night at sea stands in my memory as one of exceptional suffering, different from the frozen anxiety of the first night in being a more conventional sort of suffering, the broken-down kind consisting of weeping and sadness and spiritual pain, and different from later ones in that I still had the strength to appreciate fully what I felt.
Chpt 45-48

conventional = normal or typical
It has no decency, respects no law or convention, shows no mercy.
Chpt 53-56

convention = normally acceptable behavior
But a shark is deaf, conventionally speaking.
Chpt 77-80 *

conventionally = in a normal manner of
It is this: that the island was not an island in the conventional sense of the term—that is, a small landmass rooted to the floor of the ocean—but was rather a free-floating organism, a ball of algae of leviathan proportions.
Chpt 89-92

conventional = normal

Definitions:

(1) (convention as in: teacher's convention)
a large conference or meeting
(2) (convention as in: conventional behavior)
something regarded as normal or typical
(3) (convention as in: The Geneva Convention)
a written international agreement
(4) (meaning too rare to warrant focus)