Answer: Laughter is freely spread around without a care as it is hearing one's laugh is contagious enough to make others laugh.
Explanation: Prodigality is spending money or resources freely in a wasteful manner. Laughter in this senstence is just saying that laughter is easily spread around.
The word, "Prodigality", in the sentence means that the laughter is spent and spread without any care and restrain. Laughter spreads everywhere without any restrictions and boundaries.
Prodigality means to spend money or any resource without giving a thought to the spending. The spending which is done without care and restrain, by going extravaganza is Prodigality.
The sentence "Laughter is easier, minute by minute, spilled with prodigality, tipped out at a cheerful word", shows the use of the word prodigality to show the carefree spreading of laughter.
Therefore, here prodigality means carefree spreading of laughter.
Learn more about, Prodigality, here,
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