Definition of “ex” - English Dictionary

“ex” in American English

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exnoun [ C ]

us /eks/ plural exes infml

someone you are no longer married to

ex-prefix

us /eks/

used to show that someone is no longer in the situation or condition the person had been in; former :

The governor of Minnesota is an ex-wrestler.

(Definition of “ex” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“ex” in Business English

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expreposition

uk /eks/ us

not including a particular amount:

It only costs £249 ex VAT!

TRANSPORT used for stating that the price of goods includes transport to a particular place, and then transport arrangements and costs are the buyer's responsibility:

For units to be shipped ex Dublin, the units have to be booked before 1200 on Saturday.

ex-prefix

uk /eks-/ us

FINANCE used to mean 'not including', to show that a particular right or advantage belongs to the seller and is not included in the sale or price of an investment:

When a share goes ex-dividend, the purchaser is no longer entitled to receive the company's current dividend.
Compare

used before a job title or relationship to show that someone had that job or relationship in the past but does not have it now:

He ended up suing his ex-boss for unpaid wages.
an ex-colleague
Formal complaints were made against the ex-chairmen and the ex-chief executive.

(Definition of “ex” from the Cambridge Business English Dictionary © Cambridge University Press)