| English | French |
| incentive to insulate old buildings | mesure d'incitation en faveur de l'isolation des bâtiments existants |
| old burden | charge héritée du passé |
| old deposit | dépôt ancien |
| old hazardous site Abandoned or disused dumps and refuse tips, stockpiles and landfill sites, disused petrol service stations, closed-down coking plants and former industrial and commercial premises, etc., from which considerable risks not only to the soil and to the groundwater, but also to humans and nature, can arise | site ancien dangereux |
| old hazardous site | site ancien dangereux |
| old installation | installation ancienne |
| old landfill site Landfill that has been filled and covered with topsoil and seeded. The most common end use for landfills is open spaces with no active recreation taking place over the completed landfill. The obvious reason for this use is that the completed surface is steeply sloped to provide rapid runoff. Also, no irrigation of the cover grasses should be allowed. It is very unlikely to think that commercial or industrial buildings will be constructed on a completed landfill. If the end use is such that the public will be walking on the site, it is important that all manholes be properly secured, leachate lagoons fenced, and other potential hazards eliminated | dépôt ancien |
| old landfill site | dépôt ancien |
| old oak wood | vieille chênaie |
| Old world flycatchers | gobe-moches (Muscicapidae) |
| Old world flycatchers | muscicapidés (Muscicapidae) |
| Old world flycatchers | fauvettes (Muscicapidae) |
| Old World monkeys | singes de l'Ancien Monde (Cercopithecidae) |
| Old World monkeys | Cercopithécidés (Cercopithecidae) |
| regeneration of old plants | remise en état de vieilles installations, usines, centrales |
| retrofitting of old plants | remise en état d'anciennes installations industrielles |
| urban renewal in old city centres | rénovation des centres urbains anciens |
