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a and d
| Term | Definition |
|---|---|
| asterisk | a symbol * that is used in printed text, sometime to tell someone to read a note that can be found at the bottom of the page |
| asteroid | a minor planet; one of thousands of small bodies that circle around the sun |
| astronaut | a person who travels into outer space in a spacecraft |
| astronomer | a person who studies stars, planets and other objects in outer space |
| astronomical | (1) extremely large . the electricity bill was astronomical during December because we hang so many Christmas lights |
| dilemma | a situation in which you must make a difficult choice |
| diverse | different from each other ; made up of people or things that are different from each other |
| bilingual | able to speak and understand two languages ;using or expressed in two languages |
| trio | a group of three singers or musicians who perform together; a group of three people or things |
| trilogy | a series of three novels or movies that are closely related and involve the same characters or themes |