Complementary Event: The event that consists of all outcomes not included in the given event. In this case, rolling any number on dice that does not result in a sum of 8 would be considered complementary events.
Conditional Probability: The probability of one event occurring given that another event has already occurred. For example, if we know one die has rolled a 6, what is the probability that the sum will be 8?
Sample Space: The set of all possible outcomes for an experiment or situation. In this case, it would include all possible combinations when rolling two six-sided dice.