(aviation, law) A regulation issued by the civil aviation authority of a country or region, generally in response to the discovery of an unsafe condition affecting particular aircraft, requiring that certain actions (such as specified modifications or enhanced maintenance or inspection requirements) be performed on these aircraft in order for them to remain legally airworthy.

plural of airworthiness directive

Focused on reaching a particular objective or serving a particular purpose.

(grammar, in languages without cases) The noun or noun phrase that a verb is directly acting upon.

(grammar) A verb that agrees in person and number with the subject of a clause, by conjugation. Conjugation is a form of inflection.

An instruction given to an actor that tells the actor what should be done and in what manner to do it.

(travel) A flight in which the passenger makes intermediate stops but does not change aircraft. / (ornithology) A flight where the bird's altitude does not change significantly with each wingbeat.

(graph theory) An edge of a directed graph.

(graph theory) A graph in which the edges are ordered pairs, so that, if the edge (a, b) is in the graph, the edge (b, a) need not be in the graph and is distinct from (a, b) if it is.

(physics) An electric current that always flows in the same direction but may differ in intensity over time. / (physics) A constant electric current.