If you are unsure about the meaning of a word, you can look it up in the online dictionary or Google using the inbuilt online search feature.
To look up the selected word, select the Edit > Lookup word menu, or press the button on the Toolbar, or use the Ctrl + L hotkey. The Word Lookup dialog will show up:
Fig. 3.7.3.1.1. Word Lookup dialog
The word being looked up
The selected word in the grid whose meaning you are looking up. You may also edit this field to search for any word or phrase.
The language used to search the word's meaning. Default is English (en).
This setting affects the selection of the online dictionary (Merriam-Webster for English, Yandex for other languages) and some relevant Google search configuration.