Definition of "In" :
noun: a state in midwestern United States
noun: a unit of length equal to one twelfth of a foot
noun: a rare soft silvery metallic element; occurs in small quantities in sphalerite
adjective: currently fashionable
"The in thing to do."
adjective: directed or bound inward
"Took the in bus."
adjective: holding office
"The in party."
adverb: to or toward the inside of