Question

lightning means :
the act of assembling
the act of getting involved
the legal dissolution of a marriage
an electric discharge between clouds or from cloud to earth
get a hint: 50/50

Explanation:

Lightning is a natural phenomenon. It is an electric discharge. This discharge occurs between clouds or from cloud to earth. The other options: "the act of assembling" is about putting things together, "the act of getting involved" is about participating, and "the legal dissolution of a marriage" is divorce. None of these are related to the scientific nature of lightning.

Answer:

an electric discharge between clouds or from cloud to earth