A more thorough explanation:

Definition: Having a relation to, or being dependent on, a contingency; CONTINGENT.

Examples:

• She was expectant of good news from the job interview.
• The expectant mother was eagerly awaiting the arrival of her baby.
• He was expectant of a promotion at work, but it didn't happen.

The term "expectant" refers to something that is dependent on a certain condition or event. In the examples given, the first example shows that the person is hopeful and waiting for good news from the job interview, which is the contingency. The second example shows that the mother is waiting for the arrival of her baby, which is the contingency. The third example shows that the person is hopeful for a promotion at work, which is the contingency, but it didn't happen.