(now sciences, chiefly medicine) The agent noun derived from verb. / An adjective corresponding to a noun in -ance, having the sense of exhibiting (the condition or process described by the noun).

On which tallage must be paid.

The slow release of gas from a solid or liquid; especially the release of gases into the atmosphere of a planet

(parachuting) Acronym of high altitude, low opening. A type of skydiving where one leaves the launch platform from a high altitude and opens the parachute at a very low altitude.