/lɪŋˈɡwɪstɪk/
[adjective] Relating to language or the scientific study of language. It describes things that are connected to how people speak, write, or communicate through words.
The word 'linguistic' is younger than the science it describes — language existed for 100,000 years before anyone coined the word to study it.
The story of 'linguistic' begins, as so many English words do, in ancient Rome. The Latin word 'lingua' meant both 'tongue' — the physical organ in your mouth — and 'language' itself. This double meaning was no accident. For the Romans, the tongue was not just a body part; it was the very instrument of human communication, and so the word for the organ and the word for its greatest achievement became one and the same. 'Lingua' itself is thought to descend from an earlier Latin form 'dingua', which connects to the Proto-Indo-European root 'dṇghwéh₂s', meaning tongue, a root that also gave rise to the Old English word 'tunge', and eventually the modern English word 'tongue'.
From 'lingua', Latin formed the adjective 'lingualis', meaning 'of or belonging to the tongue or language'. This form travelled into French, where it became 'lingual', and later 'linguistique', as French scholars in the 18th and early 19th centuries began building a vocabulary to describe the formal study of languages. The suffix '-ique' in French corresponds to the English '-ic', which was itself borrowed from Latin '-icus' and Greek '-ikos', a common way of turning nouns into adjectives meaning 'of or relating to'.
The word entered English in the early 19th century, with some of the earliest recorded uses appearing around the 1820s and 1830s. This timing is no coincidence. The 19th century was a golden age of language study in Europe, when scholars like Wilhelm von Humboldt in Germany and later Ferdinand de Saussure in Switzerland were transforming the casual observation of languages into a rigorous academic discipline. English needed a word to describe this new science, and 'linguistic' — borrowed and lightly adapted from French 'linguistique' — fitted perfectly.
Interestingly, the noun form 'linguistics' — the name of the discipline itself — appeared at roughly the same time, modelled on the pattern of other science names like 'mathematics' or 'physics'. Before this, people who studied language were sometimes called 'philologists', from the Greek 'philologia' (love of words and learning), and the field was called 'philology'. The shift from 'philology' to 'linguistics' reflected a change in focus: philology tended to look at historical texts and literary language, while linguistics came to embrace all forms of human language, including everyday speech, grammar structures, and the sounds of language.
The word 'linguistic' carries within it a rich family of relatives. The Latin 'lingua' → Italian 'lingua' gave us 'lingua franca', literally 'the Frankish tongue', a phrase used to describe any shared language between people of different native tongues. Latin 'lingua' → French 'langue' → English 'language' gives us our most everyday word for the concept. And Latin 'lingua' → English 'bilingual' (speaking two languages) and 'multilingual' (speaking many) show how the root keeps branching outward into modern life. To use the word 'linguistic' is, in a small way, to reach back through centuries of human curiosity about the most defining of all human abilities: the capacity to speak.