Final answer:
Functional distance refers to how often people's paths cross in their day-to-day activities.
Step-by-step explanation:
Functional distance refers to how often people's paths cross. It is the frequency with which people encounter each other in their day-to-day activities. For example, if two people live in the same neighborhood and go to the same school or work in the same office, their functional distance is close because they are likely to see each other often.