How can I find an online dictionary to assist me in writing emails?

For example, I'm writing an email and I use a word that is not in the spell checker. I want to check its meaning. To be sure I'm using it in the right context and that it is spelled correctly. Have you ever used a word that is spelled right but it looks so strange on paper? So you want to be able to go to a dictionary real quick to check the spelling and meaning.How can I find an online dictionary to assist me in writing emails?
I use dictionary.com all the time. Plus they have a cool word of the day feature.

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