What word signifies something that is necessary or applicable to the matter at hand?

The term 'relevant' signifies something that is necessary or applicable to the matter at hand. In the context of discussions, analysis, or investigations, relevance is crucial as it helps focus on the information that directly affects or pertains to the issue being addressed. When something is deemed relevant, it means that it has a clear connection or importance to the topic at hand, facilitating better understanding and decision-making.

The other words do not convey the same meaning. For example, 'residence' relates to a place where someone lives, which doesn't pertain to the significance of information. 'Psychotic' refers to a mental condition or state, which is unrelated to the applicability of a topic. 'Property' generally refers to physical possessions or characteristics, lacking the context of relevance in discussions or decision-making. Hence, 'relevant' is the appropriate choice for indicating necessity or applicability.