Correct spelling, explanation: supplement is the only correct spelling, because the English word supplement is based on a Latin word supplementum and the word did not change much after borrowing, besides losing the distinct Latin ending.
Definition of supplement:
1. A thing that is added to another thing in order to make it better or to make something complete.
I eat well but in the winter I take vitamin D supplement just to make sure I’m healthy.
2. An extra part of a book, paper, or magazine, containing additional information
The Sunday magazine always comes with a special comic supplement. I love it.
1. The act of adding something to another thing, to make it better, complete, or to reinforce something.
I’m not doing well financially, so I supplement my income with a side job.
Incorrect spelling, explanation: despite the fact that the pronunciation of a related word, supply, may suggest this spelling,
supliment is not a correct word. The word has its roots it’s Latin, and based on that, the only correct spelling of this noun is supplement.
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