1.
If something such money or property is divided or shared fifty-fifty between two people, each person gets half of it. (INFORMAL)
The proceeds of the sale are split fifty-fifty.
ADV: ADV after v
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Fifty-fifty is also an adjective.
The new firm was owned on a fifty-fifty basis by the two parent companies.
ADJ
2.
If there is a fifty-fifty chance of something happening, it is equally likely to happen as it is not to happen. (INFORMAL)
You've got a fifty-fifty chance of being right.
ADJ: usu ADJ n