Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Ecclesiastical The fourth of the seven canonical hours.
- n. Ecclesiastical The time of day set aside for this service, usually the sixth hour, or noon.
Century Dictionary and Cyclopedia
- n. In the Roman Catholic and Greek churches, in religious houses, and as a devotional office in the Anglican Church, the office of the sixth hour, originally and properly said at midday. See canonical hours, under canonical.
- n. In music:
- n. The interval of a sixth.
- n. In organ-building, a mixture-stop of two ranks separated by a sixth—that is, consisting of a twelfth and a seventeenth.
Wiktionary
- n. The fourth of the canonical hours; usually held at noon.
- n. A sexual text message.
- n. Any electronic message with sexual context.
- v. To send a sext message.
- v. To send (someone) a (sext message).
GNU Webster's 1913
- n. The office for the sixth canonical hour, being a part of the Breviary.
- n. The sixth book of the decretals, added by Pope Boniface VIII.
WordNet 3.0
- n. the fourth of the seven canonical hours; about noon
Etymologies
- Middle English sexte, from Late Latin sexta, from Latin sexta (hōra), sixth (hour), feminine of sextus, sixth; see s(w)eks in Indo-European roots.
Examples
“The court said that threatening to press felony charges against a girl who appeared in a racy "sext" -- unless she took enrolled in a diversionary program -- was in violation of "the teen's constitutional right to be free from compelled speech and infringed on her parents 'right to direct her upbringing.”
The Huffington Post: PA Mulls Teen Sexting Laws That Would Outlaw Explicit Pictures, Texts
“It shows a student, Megan, walk out of the toilets at school doing up her blouse and smirking at the "sext" - an explicit photo taken on her mobile phone - she had just sent to her boyfriend.”
“Tiger Woods is being called a sext-happy philanderer by the National Enquirer, is getting hounded by the Florida Highway Patrol, and is facing the possibility that his wife could go to jail for domestic abuse.”
“The "sext" scandal surrounding Brett Favre may or may not be valid, but that's not stopping the parodies and spoofs from hitting the Web.”
The Huffington Post: The Brett Favre Penis Photo Scandal Gets Animated (VIDEO)
“It started with illustrating the Tiger Woods leaked "sext" messages in December which ended up being pretty popular.”
The Washington Post: The Museum of Celebrity Tweets: Surreally fun
“State official allegedly attacked after 'sext' messages”
“Schoolgirl hung herself after 'sext' sent to hundreds”
“In the same survey, 43 percent of people ages 13 to 17 say they "sext" with their peers.”
“Mobile phone text messaging has given rise to two new entries: the "sext", a message of a sexual nature, and "drexting", defined as the practice of sending a text message while drunk.”
Telegraph.co.uk - Telegraph online, Daily Telegraph and Sunday Telegraph
“A video to make teens think twice before they "sext" prompts the question - how would you feel if the picture was sent to your teacher?”
Lists
These user-created lists contain the word ‘sext’.
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Interesting words
A list of words that are odd or words that I have looked up.
concupiscence, brize, scree, scoria, forestaff, spanaemia, valetudinarianism, distasture, pyrethrum, laudanum, gentian, bicameral and 1128 more...
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Times of Day
A cycle we should know by name
dawn, sunrise, daw, sparrow-fart, moonrise, daybreak, crepuscular, false dawn, greking, night, dusk, evenfall and 16 more...

José Lisandro Sánchez Salas 'Sext' and 'sexting' have been suggested to be included in WordReference's English Dictionary:
http://forum.wordreference.com/showthread.php?t=1789431 Jun 17, 2011
ruzuzu "1. Ecclesiastical The fourth of the seven canonical hours.
2. Ecclesiastical The time of day set aside for this service, usually the sixth hour, or noon."
- American Heritage Dictionary
Jul 15, 2010