The word "tangentially" originates from the Latin verb tangere, meaning "to touch." In geometry, a line that just touches a curve at a single point is called a tangent. This concept of a fleeting, single-point contact evolved metaphorically to describe ideas or statements that only briefly "touch upon" or are superficially connected to a main topic. The adjectival suffix "-ial" forms "tangential," and the adverbial "-ly" completes the word, describing an action done in a manner that is merely touching the subject at its periphery rather than addressing it directly.

Structure: tangent (touching) + ial (adjective suffix) + ly (adverb suffix) - tangent: From Latin tangent- (stem of tangens), present participle of tangere (to touch). In this word, it functions as the core root conveying the sense of "touching." - ial: A suffix of Latin origin (-ialis) used to form adjectives meaning "of or relating to." - ly: A suffix of Old English origin (-lice) used to form adverbs from adjectives.