In this book, you will learn the meanings of 975 useful 11-letter words. You will also find the names of the parts of speech they belong to. I have also given synonyms for most of these words. Sample this:

01 -- abandonment [n.] -- (a). the act of leaving a person, place or thing without intending to return | (b). the act of giving up a practice, a course of action or a way of thinking completely and permanently [synonyms: desertion, forsaking]
02 -- accelerator [n.] -- (a). the pedal in a car, truck or other vehicle used to press with your foot for controlling the speed of the engine | (b). something that makes a process happen quickly | (c). a machine that is used to make elementary particles move at very high speeds
03 -- acceptation [n.] -- a particular sense or the generally accepted meaning of a word, phrase or expression
04 -- acclamation [n.] -- (a). loud, noisy and enthusiastic approval or welcome [synonyms: approbation, commendation] | (b). the act of electing sb using a spoken vote instead of a ballot
05 -- acquisitive [adj.] -- eager to own to acquire and own money or new possessions (material things) in a greedy way [synonyms: covetous, materialistic]
06 -- acrimonious [adj.] -- (a). (of an argument, a speech, discussion, behavior, etc.) angry and full of strong bitter, sharp or harsh feelings and words | (b). having a strong unpleasant taste or smell
07 -- adventuress [n.] -- a woman who enjoys taking risks or is willing to take risks with a view to acquire political power or get success in a business, sometimes in a dishonest way
08 -- adventurism [n.] -- a willingness to take risks with a view to acquire political power or to get success in a business, sometimes in a dishonest way
09 -- adventurous [adj.] -- (a). (of a person) willing to take risks and try new ideas, methods, things or experiences | (b). including new and interesting ideas, methods, things or experiences | (c). full of new, exciting or dangerous ideas, methods, things or experiences [synonyms: audacious, bold, daring, exploratory]
10 -- affectation [n.] -- insincere, pretentious or unnatural behavior or an action intended to impress other people
11 -- affectingly [adv.] -- in a manner that produces strong feelings of distress, pity, regret, sorrow, or sympathy, etc.
12 -- ambiguously [adv.] -- In a manner that can be understood or interpreted in more than one way [synonyms: dubiously, vaguely, puzzlingly]
13 -- ambitiously [adv.] -- (a). with the intention of becoming extremely successful, rich, powerful, wealthy [synonym: determinedly] | (b). in a way that needs a lot of work, effort, money or time in order to achieve a specific goal because it involves too much of difficulty
14 -- amorphously [adv.] -- (a). in a manner that has no fixed, regular or distinct shape, design, form or structure [synonyms: formlessly, shapelessly,] | (b). in a way that has no definite character or nature | (c). in a manner that lacks organization [synonyms: unstructured, vaguely]
15 -- androgynous [adj.] -- partly male and partly female in appearance; having both male and female characteristics; of indeterminate gender [synonyms: asexual, genderless]
16 -- anecdotally [adv.] -- according to or by means of personal description or observations rather than proven facts
17 -- appallingly [adj.] -- In an extremely bad way [synonyms: awfully, terribly] | (b). extremely bad or poor
18 -- aristocracy [n.] -- (in some countries) the people of the highest social class or position who often have special titles such as that of duke or duchess [synonym: nobility]
19 – atmospheric [adj.] -- (a). [only before noun] related to the mixture of gases that surrounds a place, earth, planet, star, etc. | (b). creating an emotional or thrilling mood
20 -- audaciously [adv.] -- In an extremely courageous, confident and often reckless or rude manner [synonyms: adventurously, daringly, boldly]