There could be number of techniques to remember a "Word" One way is, when you learn a new word, try using it in a sentence. For example when you purchase any gadget, how do you remember its various functions? and the answer is by "Using", so similarly, use a word you learnt. For example: Abstruse means "Difficult to understand" Sentence: "She gave an abstruse explanation of the problem at hand" or there is another way in addition to the above, this needs little more practice, try creating a memory link for a word, we take the same word as our example, Abstruse means "Difficult to understand" Key:"Truth" Memory Link: Truth is always difficult to understand" Usage: "Abstruse argument" "She gave an abstruse explanation of the problem at hand" you see its easy to remember when you relate things. Cheers;)))

Very excellent question.