Other forms: reconstituted; reconstituting; reconstitutes
To reconstitute something is to rebuild it or change the way it's organized. After your club president moves away, you might reconstitute the group by putting the former treasurer in charge and inviting new members to join.
You get reconstitute by adding re-, "again," to constitute, from a Latin word meaning "form something new" or "set in order." Taking the disassembled pieces of something and putting them back together is one way to reconstitute something. You might reconstitute a group of friends who spent an angry summer not speaking to each other, or reconstitute a bowl of dehydrated ramen noodles by adding boiling water, restoring them to their original, delicious state.