Can it be seen? Not in and of itself, no
Is it fictional? Erm, sort of
Do people pretend that it's real? I'd say yes
Is it mythical? Not really
Is it a human concept? Yes.
Would it be a religious icon? Nope
Would you experience it in a dessert? Are you on drugs? That means no
Is it an anthropomorphisation? No
Is it from folk lore? No
Is it a scientific concept? Assuming you mean like a law or theory, then no
Is it connected with ethics? No
Transubstantiation? No
Does it have anything to do with ways of measuring or measures of time? No
CAn it be percieved be any of the senses? erm, not really, but yes
Marriage? No, you wierdo
Is it an expression or saying? not really an expression or saying
Money? not money
Gravity? not gravity really obscure reverse referential cough
Is it in some way related to economics? not related to economics
Is it a universal human concept? This question not answered
The law? not the law.
Something associated with the weater? not weather-related
Lunchtime? not time-related
An emotion, like love? not an emotion, like love
Or a convention we all accept to make life a little simpler? and not a convention we accept to make life simpler
An inquiry into the state of someone's health, uttered merely as a ritual move in the game of smalltalk, and without any intention that it be taken literally? Dear God, no! Stop taking those drugs now! And it's not a speech act! You're all going completely the wrong direction - (go the other way!)
Is it a speech act of any sort?
Witchcraft? no....(!)
Some kind of art? no. (Nothing? Upwise?)
Magnetism? Inkspot - not magnetism
A form of alternative medicine? not a form of alternative medecine
Is it a direction? No
Is it related to the arts or entertainment? No, not really
Do people want it? a catamaenic person, perhaps?
A Clue! So, it is something a woman might want at that time of the month? Valium? A blood transfusion? A divorce? A heavy machine gun? Two heavy machine guns? All those are rather concrete, except the divorce.
Not that direct a clue, Raak. So none of those. Think of characters who particularly fulfill that definition. And something about them.
A vow of silence?
immaculate conception on the astral plane?
What clue?
Points upwise.
Hothead Paisan, Lesbian terrorist?
Or Tank Girl, Charlie's Angels, Shelob, Death, Desire, Delirium, or...running out of catamenics and catamaenads.
Weightlessness?
Think HORROR!really didn't think it was that hard!
I am just stabbing at straws now for a character that is sort of non-anthropomorphisation fictional human concept, that people pretend is real, that can and cannot be percieved by any of the senses with Catamaenic HORROR

After seven days I still have no real idea, perhaps there is a important question about this Abstract that still needs to be played.

Inkspot] Thanks for that, although I think maybe the question is 'What's the point?'

C'mon snorglekins - we're practically dead from attrition here. Give us some help before we just declare another topic altogether.

[Raak] It contributes absolutely nothing to the game, but then nor does the game seem to at this current moment, so may I point out that the Erinyes or the Eumenides are the Furies, and the Maenads are the crazed female followers of Dionysus (famous for going berserk during bacchanals and ripping things apart). Just so you know.

cata- prefix 1 down. 2 wrongly. [Greek]
oh yeah...I'm guessing this is just the greek word, the preposition meaning "down" (and, I suppose, wrongly :p). Although quite what plonking this with maenic means (that'll be the english english spelling) I have no idea.

Just guessing now, perhaps you can tell.
[ZK] Thanks for the correction. "-maen-" may be a hypercorrection of "-men-", as even the complete OED doesn't list it.