Use a dictionary to do the tasks below.

Find out the meaning of the following words and phrases (look up the words underlined in the phrases).


(a) Naturalized U. S. citizen ___________________________


(b) space __________


(c) frontiers of space ______________


(d) aboard _______________


(e) Lift off (How is it different from ‘take off’ ?) __________________


(f) crew ________________


(a) Naturalized U. S. citizen – A Naturalized U. S. citizen is the one who is not a citizen of U. S. (non-citizen) but has acquired citizenship lawfully.


(b) Space – it refers to the physical universe present beyond the earth’s atmosphere


(c) Frontiers of space – The word frontier refers to the boundary separating two different areas. Frontiers of space refers to the separating boundary between the earth and the space


(d) Aboard – aboard refers to the action of getting on or into a particular vehicle (a ship, aircraft, train or any other vehicle)


(e) Lift off (How is it different from ‘take off’?) – Take off refers to the act of being transported by air (airborne). Lift off refers to the special act of taking off vertically associated with an aircraft, spacecraft or a rocket.


(f) Crew – it refers to a set of people (a group) who work on and operate a ship, spacecraft, aircraft etc.


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