IN meaning: 1. inside a container, place, or area, or surrounded or closed off by something: 2. into…. Learn more., When one thing is in another, it is surrounded by or within it, the way chocolate chips are in a bowl of cookie batter., IN meaning: 1 : used to indicate location or position within something; 2 : to the inside of (a room, container, etc.), Orion hit a rabbit once; but though sore wounded it got to the bury, and, struggling in, the arrow caught the side of the hole and was drawn out.Indeed, a nail filed sharp is not of much avail as an arrowhead; you must have it barbed, and that was a little beyond our skill., Definition of in preposition in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more., .