Final answer:
The word 'annex' means to take control, and in this case, it refers to the authority taking control of Griqualand and turning it into a separate crown colony named Kimberly.
Step-by-step explanation:
The word 'annex' means to take control or possession of a territory. In this context, it means that the authority took control of the area known as Griqualand and turned it into a separate crown colony. They changed the name of Griqualand to Kimberly.