
Prefix
Meaning Alteration
Prefixes transform words into antonyms or give them a new meaning.

Adding 'dis-' to 'agree' forms 'disagree', indicating opposition.
Common Prefixes
Some prefixes are really common and appear in many English words.

'Pre-' is a common prefix in 'preview', meaning 'before'.
No Spelling Change
Adding a prefix doesn't typically change the spelling of the root word.

'Un-' + 'known' stays as 'unknown' with no spelling change.
Compare with
PremisePrerequisitePrologue
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