1. The state of having prolonged uncontrollable laughter, often associated with random actions.
Comedy Central has been known to put Josh into a state of hilaria, where after we turn off the TV, he laughs at the clock for at least 30 minutes.
hil-ar-i-a pronounced (hill-lair-ee-uh)
1. Archaic: amusing or humourous air, as from that recently passed through by roflcopters, roflplanes or by persons wearing lollerskates etc…
Etymology: from the former notion that it was caused by the air that is or was recently, within close proximity of such humourous objects. hil aria, funny air: see hilarious air
2. Pathology: an infectious laughter, generally prolonged and uncontrollable, caused by yet undefined, but extremely funny and boisterously joyous microscopic animals that occupy red blold cells, transmitted to humans by mosquitlols (see also: lolsquito). It is characterised mainly by rofling, loling or where one ltao (see: lmao) or any other variant of these symptoms. Hilaria is typically associated with urinary and/or fecal incontinence (see: lmaopmpappa)
Person 1: OMG what is wrong with Steveo? He's can't stop laughing, he's wet himself and it smells like he may have soiled himself also...
Person 2: That's hilariously disgusting. He must have Hilaria...
Person 3: Yeah, he does...he got bitten by a mosquitlol.
state or quality of hillariousness
The hilarity of Fred's situation was near impossible not to make you cry with laughter.
"The hilaria of his statement made it nearly impossible for Karen not to burst laughing."