Directions: Choose the appropriate meaning of the word in bold.

She was in labour for several hours before the baby was born.

In the context of childbirth, 'labour' refers to the process of contractions and delivery, which is characterized by significant pain. While 'labour' literally means the physical work of giving birth, 'pain' is the closest match among the given options. The other options (unhappiness, work, senses) don't accurately describe the experience of childbirth.