The English word "notion" traces its origins to the Latin noun "nōtiō," which signified "a becoming acquainted," "an examination," "an idea," or "a conception." This Latin term is itself a noun of action derived from the verb "nōscere," meaning "to come to know" or "to learn." An earlier form of this verb is "gnōscere," which also means "to know." Both "nōscere" and "gnōscere" ultimately descend from the Proto-Indo-European root *ǵneh₃-, a root widely recognized as meaning "to know." This root is among the most prolific in the Indo-European language family, giving rise to numerous cognates across various branches.
For example, in Greek, the cognate "gnṓsis" means "knowledge," and it is the source of English derivatives such as "gnostic" and "diagnosis." In Sanskrit, the related term "jñā́na" similarly denotes "knowledge." The Germanic branch preserves this root in Old English "cnāwan," meaning "to know," which survives in Modern English as "know." Latin itself developed related terms such as "cognōscere," meaning "to recognize," which is the source of English "cognition
The Latin noun "nōtiō" was not merely a general term but held a specialized philosophical significance, particularly in Stoic philosophy. It was used to translate the Greek term "énnoia," which referred to a concept formed in the mind or an intellectual apprehension. The Roman statesman and philosopher Cicero employed "nōtiō" with this precise philosophical nuance, emphasizing its role as a mental conception or idea rather than a vague impression.
The word "notion" entered the English language in the late 14th century, borrowed from Old French "notion," which itself derived directly from Latin "nōtiō." This borrowing reflects the typical medieval transmission of learned vocabulary from Latin through Old French into English, especially in philosophical and intellectual contexts. Initially, "notion" in English retained much of its original precision, denoting a mental concept or idea.
However, over time, the semantic range of "notion" in English underwent a notable shift. The word experienced a process of devaluation or semantic weakening, moving from a precise philosophical term to one often used to indicate a vague, ill-defined, or even whimsical idea. For instance, the phrase "I have a notion to go" exemplifies this colloquial usage, where "notion" suggests an impulse, inclination, or half-formed thought rather than a fully developed concept. This weakened sense is especially prominent in American English, where "notion" frequently conveys a casual or tentative idea rather than a rigorous
In addition to its abstract meanings, the plural form "notions" developed a distinct commercial sense in American English. By the 19th century, "notions" came to denote small useful articles such as buttons, pins, needles, thread, and other sewing accessories commonly sold in general stores. This commercial meaning is unrelated to the original philosophical sense but likely arose through metaphorical extension, perhaps from the idea of "small useful things" as mental "concepts" or "items" of practical use.
In summary, the English word "notion" originates from Latin "nōtiō," a noun of action from "nōscere," itself from the Proto-Indo-European root *ǵneh₃-, meaning "to know." The term was initially a technical philosophical concept in Latin, translating the Greek "énnoia." It entered English in the late 14th century via Old French, retaining its intellectual meaning before undergoing semantic weakening to denote vague or impulsive ideas. The plural "notions" acquired a separate commercial meaning in American English, referring to small sewing articles. This etymological trajectory illustrates