WAVE – (noun) 1. The best known wave is the wave that you get on the surface of water when you throw a stone into it. A wave has a shape, but this shape is a moving shape. The waves on the sea are similar to the waves that you get in a lake when you throw in a stone, but are usually much larger. They are caused by wind blowing over a very large area of sea. Waves have a shape and they travel along the surface of the water, but they also have energy in them. For example when a big wave breaks on the sea shore it can knock a person over; also a small boat is lifted up and down by the waves in the sea. 2. Hair that has the shape of a wave is called wavy hair; or you can say she has waves in her hair. 3. Scientists who have studied light have discovered that light also travels in waves through the air. These waves are very small. See diagram 24 to see a sine wave.

WAVE LENGTH – (noun) This is the distance from the top of one wave to the top of the next wave. See diagram 24.

WEATHER – (noun) The weather is the word used to describe if it is raining or not, hot or cold, blowing or not. “The travellers had a difficult time because the weather was so bad which made the roads muddy and slippery.

WEIGH – (verb) means to measure the weight of. This is done on a scale. See diagram 52.

WEIGHT – (noun) The weight of something is how heavy a thing is. A thing has weight because of the earth’s gravity. See GRAVITY. The more mass a thing has the more it will be the pull of the earth’s gravity so the more it will weigh. Weight and mass are both measured in Kilograms.

WEST – (noun) When you face North, West is on your left hand side. West is the direction where the sun sets. See diagram 39.

WHETHER – (conjunction) means ‘if’. “She was not sure whether she should go to the party or not.

WHOLE – (adjective) means complete, having all its parts there. “He ate the whole cake. Please tell me the whole story of what happened. The whole motor car got burned. He painted the whole house.

WHOLE NUMBER – (noun) See INTEGER.

WITHDRAW – (verb) 1. Withdraw means to move back from. “When the dog rushed at him he quickly withdrew” – (Withdrew is the past of withdraw) “behind the gate. “ 2. Withdraw also means to take something out of something else. “I withdraw my hand from my pocket so that I can shake your hand. “ 3. Withdraw is often used about money. When you take money out of a bank account you withdraw it. “I will withdraw R20 to buy some food. 

WITHOUT – (preposition) 1. Without means not with. “He came without any food so now he is hungry. Please do not go without me. “2. It also means on the outside of.” The hall was full so many people had to sit without.

WORK OUT – (verb) means to do something in your mind which will give you an answer. You can also write things down on a piece of paper when you work something out, but you still must do some logical thinking. See LOGI “Work out the answer to this question. She had to work out a way to be able to do her studying for the test as well as going to the party.

WORTH – (noun) means price or value. See VALUE. “What is that shirt worth? It is worth R30. He has been a good friend to me for many years so his friendship is worth a lot to me”.