ex

Etymology 1

From Latin ex.

noun

1. The name of the Latin-script letter X.
   Thus first C checks to see if ex and wye are equal. The resulting value of 1 or 0 (true or false) then is compared to the value of zee. 1984 Waite, Prata & Martin, C (Computer Program Language), p. 190

Etymology 2

From the fact that crossing something out often results in the shape of the letter X.

verb

1. To delete; to cross out

Etymology 3

Standalone use of prefix ex-.

noun

1. (colloquial) A former partner or spouse, usually short for ex-girlfriend, ex-boyfriend, ex-wife or ex-husband.
   Her ex is still sending her flowers, even though she has moved on.

adj

1. Ex-, former, previously but no longer.

Etymology 4

From Latin ex (“out of, from”); originated as a telegraphic abbreviation.

adj

1. (rail transport, of a train) the place the train originated from or called at prior to the present location.
   When between the station and the junction I was looking to the rear of the train on the near side, thinking it possible that we might receive a signal from the guard to shunt at Swindon junction to allow the 2.27 a.m. fast train ex Derby to pass, but the guard did not give any signal 1885, F. A. Marindin, quoting Arthur Oakes, edited by Henry G. Calcraft, Annual Reports, Returns, Etc, Midland Railway - inquiry into the causes of a collision at Swinton station, page 96
   The train was the 12.40 p.m. ex Derby on January 14th, 1914 1921, John Hope Fellows, editor, The Locomotive News and Railway Contractor, Volumes 8-10, Locomotive news agency, page 34
   All trains from start of service up to the 13.57 ex Norwich (16.45 ex Nottingham) are 4 cars between Nottingham and Liverpool and all East bound trains are 4 cars from Liverpool Lime Street as far as Nottingham. 11 February 2003, "Fat Richard", “Re: Chiltern not stopping at Warwick Parkway”, in uk.railway (Usenet), retrieved 2018-06-11, message-ID <2a1e76b8-185c-4b27-a8d2-6f3f3331f6cd@dp10g2000vbb.googlegroups.com>
   The outward timing is: Ashford International railway station (domestic side) *departs at 09.25hrs* (connecting with the 07.32 ex Brighton *Marshlink* train and, 08.37 ex London St. Pancras International *HS1* train) 17 March 2016, Derek Jones, “South East Bus Festival, Detling, 2 April 2016”, in Invicta Newsgroup (Usenet), retrieved 2018-06-11, message-ID <CAJ9GgXJNSabs&#61;QsEzzf-tCXQcXPdZyRZgiEtk9J3e8ToRs+ctg@mail.gmail.com>

Etymology 5

Clipping of expensive.

adj

1. (Singapore, colloquial) expensive, dear
   It's too ex.

Etymology 6

noun

1. (Canada) Clipping of exhibition.