In the recipe I used today to make some cacen siocled (chocolate cake), the word used to describe the result of mixing all the ingredients together is batter, at least in the English translation of the recipe. This is something I would call mixture – for me batter is a mixture of flour, water and a bit of salt that is used to coat fish before deep frying it. It sounds a bit strange to call cake mixture batter, though I have come across this usage from time to time, often in American recipes.
The word batter was first recorded in the late 14th century and comes from the Old French word batteure (a beating), from the Latin battuere (to beat, strike), and via Gaulish from Proto-Indo-European base *bhau- (to strike), which is also the root of buttock, butter, butt in English, via the Frankish *bōtan, the French word bouter (end, tip, butt, nub), and the Spanish botar (to bounce).
What does batter mean to you?