The terrific free WordWeb dictionary/thesaurus is always one of the very first apps I install on any new system. WordWeb may not be quite as comprehensive as some of the alternative online services but it will generally provide sufficient information and more than compensates with its versatility plus almost immediate accessibility and responses.
WordWeb provides users with word and common phrase definitions plus a pretty useful list of synonyms and antonyms. The latest versions also incorporate 5000 audio pronunciations. It integrates with literally anything which contains text, both offline and online: Simply press the ‘Ctrl’ key and then right click on the word (or phrase).
Here is a typical result from a Microsoft Word document:
Here is a typical example from a web page:
So useful to check meanings and correct word usage; especially useful for writers to quickly look up synonyms so they are not repeating the same word over and over. Highly recommended!!