The best place to find definitions of Arabic words in Arabic is in an Arabic dictionary, either in book form or online.
Yes, that website is an online dictionary.
You can find words by typing their definitions into a search engine or a dictionary website such as Merriam-Webster or Dictionary.com. These resources will provide you with the word that matches the definition you have entered.
You can find vocabulary words and their definitions for "Lord of the Flies" in the glossary at the back of the book or by using a dictionary or online resources that provide definitions for specific words. Reading the novel with an annotated edition can also help provide explanations for unfamiliar vocabulary.
Dictionaries, thesauruses, and online resources like Merriam-Webster or Dictionary.com are helpful for finding definitions and synonyms for unfamiliar words.
maybe they don't know how to do it online
There are a number of places online one might go to find definitions. Visiting an online dictionary is a great resource, as well as a website regarding the word you are looking for.
on definition.com stupid
There are a wide selection of places to find definitions. Using an online dictionary such as Miriam Webster is reputable. You can also find it in a paper dictionary if you are not near a computer.
There are a large number of places online where one can find the meaning of the word pleading. Any online dictionary would be able to do this, any online thesaurus would be able to tell you alternative words.
You can access Google's online web application which allows you to directly access Google's online dictionary and find the definitions of all words in the dictionary.
The definition of the word "Evoked" is to bring to or recall the conscious mind. You can find more definitions for words online at The Free Dictionary website.