change

a period of time of which particular events or stages of development are typical

a gradual process of change and development

a good or valuable thing or a special person that has been discovered but was not known about before

a person who is one of the first people to do something

a small piece or amount of something that is left from a larger original piece or amount

thinking now about something in the past

the present situation

a change from one form or type to another, or the process by which this happens

a general development or change in a situation or in the way that people are behaving

sudden and unexpected, and often unpleasant