activated sludge(Sludge that has been aerated and subjected to bacterial action; used to speed breakdown of organism matter in raw sewage during secondary waste treatment)
active participation(The involvement, either by an individual or a group of individuals, in their own governance or other activities, with the purpose of exerting influence)
addition polymer(A polymer formed by the chain addition of unsaturated monomer molecules, such as olefins, with one another without the formation of a by-product, as water; examples are polyethylene, polypropylene and polystyrene)
additional packaging(Additional packaging around the normal sales packaging. For example as protection against theft or for the purpose of advertising; the customer may leave the additional packaging in the shop for waste collection)
adequate food supply(A quantity of nutriments that meets fundamental nutritional requirements and is provided to a person, group or community on a continuing basis)