instantvalidationcode
nounUK /ˈɪnstənt ˌvælɪˈdeɪʃən kəʊd/
US /ˈɪnstənt ˌvælɪˈdeɪʃən koʊd/
A short set of letters or numbers you get right away to prove something is real.
I typed the instant validation code from my email to confirm my new account.
OTHER MEANINGS
2. A quick check that makes sure information is correct as soon as it is entered.
The form uses an instant validation code to catch mistakes before you submit it.
3. A temporary number sent to your phone to prove it is really you.
The app sent an instant validation code by text message.
4. A small program snippet that checks data immediately while a user types.
The developer added an instant validation code to the signup page.