I am a devoted user of Antidote 8 , but aside from some pitifully infantine Applescripts that take the word and spit them into Antidote so that it opens at the required page, I have absolutely no idea how to build a workflow that would be able to:
a. get Alfred to display inline definitions/synonyms/antonyms (depending on the keyword, I imagine) and copy the selected one to the clipboard (much in the same way the Wordreference and Glosbe workflows posted here work)
b. trigger the correcteur from Alfred (i.e. invoke alfred with the chosen keyword, type the text to correct and have the correcteur open with that text).
I'd be forever reconnaissante to any kind soul willing to dirty his hands for this.