a movement you make with your hand, arm, or head to express what you are thinking or feeling

the force that makes objects fall to the ground or that pulls objects towards a planet or other body

not level or smooth

an illness, injury, or condition that makes it difficult for someone to do the things that other people do

someone who is related to someone who lived a long time ago

causing a lot of disagreement or argument

a series of actions that you take in order to achieve a result

to join or fix one thing to another again

at the beginning

a form of energy that comes from a nuclear reaction and that in large amounts can be very dangerous

very important and necessary

a narrow beam of light, heat, or energy

to separate into parts or groups, or to make something separate into parts or groups

the ability of a substance to stop the flow of an electric current through

to stay away from a person, place, situation

a situation in which someone or something does not succeed

the amount of money that you need to buy or do something

easy to understand or see

having length, depth, and height

to accept and deal with a difficult fact or problem

something such as a car or bus that takes people from one place to another, especially using roads

something can be done or achieved

to move your body or part of your body so that it is not straight

dangerous

a student who has one degree and now studies at a university for a more advanced degree

to do a job or a piece of work badly

to remove from a person the special human qualities of independent thought, feeling for other people

to not understand someone or something correctly

a device that keeps aircraft, spacecraft, and ships moving in a particular direction without human involvement