For a basic ex definition, it is the phonetic spelling of the 24th letter of the alphabet.
Another ex meaning involves broken relationships. An ex-spouse or an ex-partner is often simply referred to as an ex.
In Latin, the ex meaning is “out of” or “from.” It shows up in phrases like “Deus ex machina.”
You may also see this ex definition on a bookplate identifying the owner of a book. It will read, “Ex libris."
(of goods) sold direct from
carpet tiles offered at a special price, ex stock
the cost is £5,000 ex VAT
a former husband, wife, or other partner in a relationship
I don't want my ex to spoil what I have now