This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or moving along or in the direction of a tangent.

adj. Merely touching or slightly connected.

adj. Only superficially relevant; divergent: a tangential remark.

adj. Referring to a tangent, moving at a tangent to something.

adj. Merely touching, positioned as a tangent.

adj. Only indirectly related.

adj. Of or pertaining to a tangent; in the direction of a tangent.

In geology, specifically applied to strains in the earth's crust which are applied in a direction tangential to its surface.

Of or pertaining to a tangent; being or moving in the direction of a tangent.

Figuratively, slightly connected; touch-and-go.

n. In the geom. of plane cubic curves, the point at which the tangent from any point cuts the curve again. The point of intersection is called the tangential or the point of tangency.

adj. of or relating to or acting along or in the direction of a tangent

adj. of superficial relevance if any

irrelevant   

tangential plane    tangential coördinates    conic tangential    simple tangential strain   

confidential    consequential    credential    deferential    differential    essential    existential    exponential    inconsequential    influential   

radial    transverse    compressive    axial    ninety-degree    homolytic    ionisation    diagonal    rotational    upward