Incorrect spelling, explanation: there is no need to include two double consonants in this word: -t and -s. Original Middle English spelling indicates the double -s only. This mistake may occur because of the frequent presence of double consonants in various English words. However, the only correct form is witness, not wittness.

Correct spelling, explanation: the word witness is a popular English noun, as well as a verb. It originates from Middle English witnesse and from Old English ġewitnes. It is easy to see that this word contains only one double consonant: -s. There is no reason why someone should add the double -s to this noun. Therefore, the only correct form is witness, not wittness.

Definition of witness:
1. noun, a person who sees an event, typically a crime or accident, take place
The witness provided a detailed account of the accident to the police, helping them piece together what had happened.
The courtroom was filled with witnesses who were called to testify and provide their firsthand observations of the event.
2. verb, see (an event, typically a crime or accident) happen
I was fortunate enough to witness a breathtaking sunset while standing on the mountaintop.
The security camera footage captured the moment when the suspect attempted to break into the store, providing clear evidence of the crime that was witnessed by the camera.

Collocations with witness:
Some most commonly used collocations include:
1. Eye witness: a person who directly observes an event or incident.
The eyewitness recounted the details of the accident, providing a firsthand account of what happened.
2. Key witness: a crucial or significant individual who has important information or evidence about a case.
The key witness‘s testimony played a crucial role in convicting the defendant of the crime.
3. Reliable witness: a trustworthy and dependable person whose testimony holds credibility.
The judge considered the testimony of the reliable witness to be credible and significant in reaching a verdict.
4. Material witness: a witness whose testimony is considered essential to a legal proceeding.
The prosecution declared the individual a material witness, as their testimony held crucial information that would impact the outcome of the trial.