by

The word 'by' originates from the Old English preposition 'bī' or 'bē', meaning 'near' or 'at'. This Old English term is derived from the Proto-Germanic 'bi', which carried a similar locative sense of 'around' or 'about'. The Proto-Germanic root can be traced further back to the Proto-Indo-European 'ambhi-', meaning 'around'. The core semantic journey is from a concrete, spatial sense of proximity ('near') to a wide range of abstract grammatical functions in modern English, including agency, means, manner, and time. This evolution demonstrates how a fundamental spatial concept expanded to become one of the most versatile and frequently used function words in the language.

The word 'by' is a simplex word, a short adverb and preposition inherited from Old English. It cannot be meaningfully segmented into smaller morphemes in its modern English form.