From International Dictionary of Marine Aids to Navigation
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Routine work necessary to keep the fabric of a building, the moving parts of machinery, grounds, gardens or any other artefact, in good order.

Reference: Stirlingcharter

(This definition was noted at the IALA Seminar on the Practical Aspects of Lighthouse Preservation in Gothenburg 2005)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM