1. day one - Noun
2. day one - Adverb
The very beginning.
I've been with the project since day one.
(US, slang) A close, longtime friend, one who has been around since the beginning.
day one
At the very beginning; when something is entirely new.
to buy something day one
Bananarama were written off from day one. Nobody believed in us but us. We kept having hits despite the record company, despite the press. Siobhan Fahey
Anyone who believes cannot experience miracles. By day one does not see any stars. Anyone who does miracles says: I cannot let goof the earth. Franz Kafka
My favorite process is writing, from day one. The songs I have written throughout the years were a real great opportunity for me to communicate, because I think tha'ts my prime objective on this planet. Gloria Estefan
The masters thought they were loved until one day one of their favorites farted loudly while serving dinner and the next day was gone. The very first manifestation of the classless society is the disappearance of the servant class. John Kenneth Galbraith
My philosophy from day one is that I can sleep better at night if I can improve an individual's knowledge about food and wine, and do it on a daily basis. Emeril Lagasse
The American male runs half of the global world and grows up on rock music from day one. If you can alter the psyche of someone who's growing up to be a rapist or a total misogynist, you're creating values and instead of making the void bigger, you're making it smaller. Courtney Love