Step 1: Meaning of kinship.
Kinship is a fundamental organizing principle of society. It refers to the system of social relationships that are derived from blood (consanguinity), marriage (affinity), or adoption.
Step 2: Importance of kinship.
Kinship provides rules for inheritance, succession, social obligations, and support networks within families.
Step 3: Conclusion.
Thus, kinship means the web of relationships based on blood and marriage ties.
Final Answer: \[ \boxed{\text{Kinship = relations by blood, marriage, or adoption}} \]