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| Archetype | classic example of |
| Archives | collections of old records; place of storage of old documents |
| Articulate | clear; lucid; eloquent |
| Artifice | deception; trickery |
| Artisan | craftsman |
| Ascetic | without luxuries; severely simple |
| Assiduous | thorough; diligent |
| Assuage | to calm |
| Astute | perceptive; sharp-witted |
| Asylum | place of refuge or safety |
| Atheist | person who does not believe in God |
| Atrophy | waste away from lack of use |
| Attenuate | weaken |
| Augment | increase; make bigger |
| Auspicious | favorable; promising to turn out well |
| Austere | severely plain |
| Aversion | a dislike of |
| Balk | hinder and prevent; hesitate over |
| Banal | common; dull |
| Banality | ordinariness; dullness |