Incorrect spelling, explanation: you can’t spell registration as registeration because English word formation rules don’t allow it. The noun registration comes from the verb register, but when forming a noun with -ation, English often drops part of the original word if it ends in -er or a similar sound. For example, we say regulate → regulation and concentrate → concentration, not regulateation or concentrateation. Registeration is simply a spelling mistake.

Correct spelling, explanation: the word registration comes from the Latin root registrare, meaning to record or enter in a list. The suffix -ation is a common Latin-derived ending used to form nouns from verbs, indicating an action or process. The word registeration does not have an etymology because it is a misspelling and does not exist in standard English. It likely results from people mistakenly assuming that the noun must retain the full root register before adding -ation.

Definition of registration:
Noun, the process of officially recording or enrolling something, such as a person, vehicle, or event, in a formal system or database
The registration for the upcoming marathon closes next week, so don’t forget to sign up in time.
You must provide proof of identity and payment to complete the vehicle registration process.

Collocations with registration:
Some of the most commonly used collocations include:
1. Registration form: a document that people fill out to register for something.
Please complete the registration form and submit it to the front desk.
2. Registration deadline: the last date by which one must register.
The registration deadline for the marathon is fast approaching.
3. Registration process: the steps required to register for something.
The registration process is simple and takes only a few minutes.
4. Registration fee: a payment required to complete the registration.
The registration fee for the workshop is $50.