Working efficiently to produce a desired result.

more distant in space. A greater distance; at a more distant point. (Used to introduce an additional point); also. To help to happen or develop; promote.

on fire. When something is burnt by fire. To use as fuel for a fire to make light or heat.

added thing that improves another. To go with so as to make the whole complete.

Making you feel a bit shocked because unexpected. To do something that another person didn't expect.

existing in or derived from nature. naturally. person having innate talent.

Way someone acts toward another.

physical or mental feature which is regarded as indicating condition of disease. Signs that suggests that there are problems.

organism that lives in or on another organism and benefits by deriving nutrients at other's expense.

The retirement of someone from service e.g. army. To deliver an electric charge.

To find something new that was not known before.

slight pain. make someone feel uneasy.

medicine or treatment for disease or injury. Treatments that relieve pain or cures illness. To solve or correct a problem.

essential. basic requirements of life.

Of or relating to physical health or medicine. A health check or test.