a stuffy college professor word that describes when you use part of an object to refer to the whole object. If you call you gun a "nine," or refer to a guy who is mean as a "dick," thats synecodche. Like most college professor words, it is originally greek, transferred into Latin and then imported into english.
When you and your friend, family member, etc doing something at the exact same time such as saying the same thing, dressing in the same outfit, or calling each other at the same exact time.
Who knew Caitlin and Siobhan would where the exact same hoodie, jeans, AND necklace on the same day! They must be physco-synced.
As we sat at the movie, both Caitlin and Siobhan yelled "Thats so awesome!" Sometimes I wonder if its more than just physco-syncronicity...