The word "tangent" generally refers to something that touches or is related to a subject but does not directly engage with it. Specifically, in mathematics, a tangent is a line that touches a curve at a single point without crossing it. In more general usage, it can refer to a remark or topic that is only loosely related to the main subject of discussion.
Based on your list of options, "touching" would be the closest meaning to "tangent."
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