The definition of levity is silly or light speech or behavior, usually at an inappropriate time.(noun)
An example of levity is someone is being disrespectful to a police officer after being arrested.
See levity in Webster's New World College Dictionary
noun pl. levities
Origin: OFr levité < L levitas < levis, light
See levity in American Heritage Dictionary 4
noun pl. lev·i·ties
Origin: Latin levitās
Origin: , from levis, light; see legwh- in Indo-European roots.
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