gre词汇：2012新GRE阅读词汇笔记（45）
| coeval | living at the same time as; existing during the same period of time; contemporary; of the same age |
| cog | tooth projecting from a wheel |
| cogent | convincing |
| cogitate | think over; ponder |
| cognate | having a common origin; related linguistically; allied by blood; similar or akin in nature; Ex. cognate languages; N. |
| cognitive | having to do with knowing or perceiving related to the mental processes; N. cognition: the mental process of knowing |
| cognizance | knowledge; ADJ. cognizant; having knowledge; aware |
| cohabit | live together |
| cohere | stick together |
| cohesion | tendency to keep together |
| cohorts | group of people who share some common quality; armed band; a group of between 300 and 600 soldiers under one commander (in the ancient Rome) |
| coiffure | hairstyle |
| coin | make coins; invent or fabricate (a word or phrase); N. coinage: word or phrase recently invented |
| coincidence | the chance occurrence, at the same time, of two or more seemingly connected events; V. coincide: happen at the same time; be in agreement; CF. coincident; CF. coincidental |
| colander | utensil with perforated bottom used for straining |
| collaborate | work together; cooperate treasonably with the enemy |
| collage | work of art put together from fragments |
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