verb

• (intransitive) To become something different.
  "The tadpole changed into a frog."
• (transitive, ergative) To make something into something else.
  "Lo I the man, whoſe Muſe whilome did maske, As time her taught in lowly Shepheards weeds, Am now enforſt a far unfitter taske, For trumpets ſterne to chaunge mine oaten reeds, And ſinge of Knights and Ladies gentle deeds[…]"
• (transitive) To replace.
  "Ask the janitor to come and change the lightbulb."
• (intransitive) To replace one's clothing.
  "You can't go into the dressing room while she’s changing."

noun

• (countable, uncountable) The process of becoming different.
  "The product is undergoing a change in order to improve it."
• (uncountable) Small denominations of money given in exchange for a larger denomination.
  "Can I get change for this $100 bill, please?"
• (countable) A replacement.
  "a change of clothes"
• (uncountable) Balance of money returned from the sum paid after deducting the price of a purchase.
  "A customer who pays with a 10-pound note for a £9 item receives one pound in change."