Each week The Sun's John McIntyre presents a moderately obscure but evocative word with which you may not be familiar — another brick to add to the wall of your working vocabulary. This week's word:
The word, pronounced jak-tuh-TAY-shun, comes from the Latin verb jactare, "to throw." In jactitation, your limbs are thrown about without your volition.
There is a specialized legal meaning of the word as well growing out of a sense of a boastful public declaration — to "throw out" a statement. Garner's Dictionary of Legal Usage says that it narrowly meant to make of false declaration of marriage to someone but has since taken on broader usage.
Example: She's also prone to hypnagogic jactitation, which means she twitches abruptly as she's falling asleep.