In - expressing a period of time: being enclosed or surrounded; can be used as a preposition, ajective and adverb; also idiomatic meaning fashionable or influential On - in contact with, or part of something or supported by something else; as an adverb, to continue and in contact with and supported by

In - expressing a period of time: being enclosed or surrounded; can be used as a preposition, ajective and adverb; also idiomatic meaning fashionable or influential On - in contact with, or part of something or supported by something else; as an adverb, to continue and in contact with and supported by