peripherally

This word operates on two distinct levels: the literal and the figurative. In a literal sense, it refers to the outer limits of a physical area or a biological system. It is most commonly used in medical contexts (referring to the peripheral nervous system) or when describing vision (peripheral vision), where something is seen "out of the corner of the eye" rather than focused upon directly.

Figuratively, it describes a relationship or involvement that is indirect, secondary, or unimportant. When someone is peripherally involved in a situation, they are on the "edges" of the event—they know about it or are affected by it, but they are not a key player or a central figure.

In terms of register, "peripherally" is more formal than saying "slightly" or "kind of." It is frequently used in academic, legal, or corporate environments to precisely define the degree of connection between two ideas or people. While "marginally" often implies a very small amount or a barely acceptable level, "peripherally" emphasizes the distance from the center of focus or importance.