Perhaps you're thinking of the following:
* "capit" as a prefix might be a misremembering of the prefix "cap", which means "head" or "top". Examples include "captain", "capital", "capitol", etc.
* "capit" as a suffix might be a misremembering of the suffix "-al" which signifies "relating to" or "of the nature of". Examples include "national", "historical", "practical", etc.
If you can provide more context or the word you're trying to understand, I can give you a more accurate answer.