Conversation between two or more individuals. take part in dialogue.

porous device removing impurities etc. from liquid or gas. Devices to remove certain types of light, sound. To remove unwanted substances from a liquid or gas.

The area in front of a picture or person. To make something more visible or important.

Used to add new (often different) information.

relating to tutor or tutor's tuition. period of tuition given by university or college tutor.

A change to make something function better.

not same as another or each other.

include as necessary or integral part.

assembled or made from whatever is available, and so unlikely to be of highest quality. mark or wound made by scratching. To rub your skin with your nails to stop an itch.

length of space between two points. make distant in position or nature.

performed using random selection. To arrange in a random order.

A position not as important as the main event.

repeated decorative design. Colors or shapes which are repeated on objects. To copy the way something else is made.

Fact of increasing; amount something grows by. To make or become larger in size or amount.

quality or state of being physically strong.