- To ostracize is to deliberately exclude or leave someone out.
An example of ostracize is when you don't invite one person in the class to a party that everyone else is going to.
ostracize definition by Webster's New World
ostracize definition by American Heritage Dictionary
transitive verb os·tra·cized, os·tra·ciz·ing, os·tra·ciz·es
- To exclude from a group. See Synonyms at blackball.
- To banish by ostracism, as in ancient Greece.
Origin: Greek ostrakizein, from ostrakon, shell, potsherd (from the potsherds used as ballots in voting for ostracism); see ost- in Indo-European roots.