Dinner is, for most English speakers, the main meal of the day. When the word was first used (in the 12th century) it referred to a midday meal, but it did not remain so for long. By the early 16th century it had become the first meal of the day, what we would call breakfast. No doubt those 16th century diners had their own reasons for this but it makes perfect sense etymologically as the verb to dine comes from the Late Latin disjejunare, “to breakfast” via the Old French disner. The Latin word disjejunare, incidentally, is quite literally “break fast”, being dis (“undo”) + jejunare (“to fast”) and also gave the French word déjeuner “breakfast”*. Obviously, dinner could not get any earlier than breakfast and after the 16th century it drifted through the day, being served later and later until, during the Victorian era, high society sat down to dinner at 10 p.m. Having one’s main meal of the day at such a late hour meant that many tummies were growling by late afternoon. To avoid that unpleasant hollow feeling, a new meal was invented. It was just a light snack, basically a few cakes and pastries served with the expensive new status symbol, tea. Consequently, the meal was called “tea”.
The name used for this drink tells a lot about how the word entered a language. Like French, Spanish, Italian, Dutch, German, Danish and Swedish (thé, te, tè, thee, thee, te and te, respectively) we acquired the name from Malay traders who called it te, a word they learned from the Amoy dialect of Chinese. The Portuguese, who call it cha, traded with Chinese who spoke the Mandarin dialect, in which it is called ch’a. Throughout the Middle East and India, the word is usually chai or some variant thereof. This is also the Russian word as tea reached Russia overland, via the Silk Road. In India, tea is brewed with milk and a mixture of spices called chai masala (Hindi for “tea spice”). This concoction is known as masala chai (Hindi, “spiced tea”) or simply as chai. As a result, the word chai has now entered the English language and it is not uncommon to see coffee bars offering something called chai tea (literally “tea tea”).