Meaning : One who completely declines alcohol.
— Example sentences : His friend denied to go to the office party where all were supposed to enjoy the drinks because he was a teetotaller.
— Trick to remember this word -> Let’s first break this word in two parts : 1. Tee and 2. Totaller
Someone may choose “tea” as the alternative beverage who completely denies to have alcohol and let’s add “total” since, he will add “tea” totally as his choice for beverage.
*This logic has nothing with the history of the word but just an illogical trick to learn and remember this for a long time (hopefully, forever :p).