Margin (a.k.a. spread)
The margin (also referred to as "spread" or "vig/vigorish") is the difference between the probability of a betting outcome happening and the odds that bettors can place bets with (for this outcome). In traditional online betting, it is also referred to as the "bookmakers advantage" or "house edge".
On Azuro protocol, margin is one of the immutable properties of a Condition, set at the time of its creation.