Regurgitation (noun)

1. The act or process of bringing back up food or liquid that has been swallowed.
2. The act or process of discharging something that has been swallowed or absorbed.

Origin:

From regurgitate + -ion, from latin regurgitare "to wash back".

Examples:

1. The baby had regurgitation after every feed.
2. The regurgitation of stomach acid can cause heartburn.
3. The patient had regurgitation of food due to a weak esophageal sphincter.
4. The bird's regurgitation of pellets is a natural way of digesting food.
5. The regurgitation of bile can cause nausea and vomiting.