Definition of IT
1
: that one —used as subject or direct object or indirect object of a verb or object of a preposition usually in reference to a lifeless thing <took a quick look at the house and noticed it was very old>, a plant <there is a rosebush near the fence and it is now blooming>, a person or animal whose sex is unknown or disregarded <don't know who it is>, a group of individuals or things, or an abstract entity <beauty is everywhere and it is a source of joy>
2
—used as subject of an impersonal verb that expresses a condition or action without reference to an agent <it is raining>
3
a —used as anticipatory subject or object of a verb <it is necessary to repeat the whole thing> ; often used to shift emphasis to a part of a statement other than the subject <it was in this city that the treaty was signed>
b —used with many verbs as a direct object with little or no meaning <footed it back to camp>
4
—used to refer to an explicit or implicit state of affairs or circumstances <how is it going>
5
: a crucial or climactic point <this is it>
Do you like your current residence?