Spelling
Additonal or additional?
Additional is the right spelling. Additonal is a common misspelling of it.
ADDITONAL leaves out the I after IT.
Why people write ADDITONAL
Some letters are barely said, or not said at all, in everyday speech (the N in government, the P in pumpkin), so they drop out when the word is written as it sounds.
Spell the word out loud the slow way, exaggerating every letter ("govern-ment", "pump-kin"), and the missing letter comes back.
How often ADDITIONAL is misspelled
In the web pages Google counted for its trillion-word corpus (Peter Norvig's word counts), ADDITONAL appears 1 times for every 1,000 ADDITIONAL, about once for every 1,000 correct uses.
Is ADDITONAL a word?
No. ADDITONAL is not in NWL2023, Collins Scrabble Words or ENABLE, the word lists Scrabble and other word games use, so no word game accepts it. ADDITIONAL is in all three and scores 12 points in Scrabble before bonus squares.
What additional means
Pertaining to addition.
More words with the same mistake
A letter left out:
More spelling help
Commonly misspelled words, grouped by the mistake · Free printables and word games for teachers · Unscramble any letters