The Word is:”it”
1.used to refer to a thing previously mentioned or easily identified.
“a room with two beds in it”
referring to an animal or child of unspecified sex.
“she was holding the baby, cradling it and smiling into its face”
referring to a fact or situation previously mentioned, known, or happening.
“stop it, you’re hurting me”
2.used to identify a person.
3.used in the normal subject position in statements about time, distance, or weather.
“it’s half past five”
4.used in the normal subject or object position when a more specific subject or object is given later in the sentence.
“it is impossible to assess the problem”
5.used to emphasize a following part of a sentence.
“it is the child who is the victim”
6.the situation or circumstances; things in general.
“no one can stay here—it’s too dangerous now”
7.exactly what is needed or desired.
“they thought they were it”
sexual intercourse or sex appeal.
“the only thing I knew nothing about was ‘it’”
denoting a person or thing that is exceptionally fashionable, popular, or successful at a particular time.
“they were Hollywood’s It couple”
10.(in children’s games) the player who has to catch the others.
Source credit: Google