1. tribe; race; people; family
エルフ族は人間よりずっと長生きだ。The elf race lives far longer than humans.
2. group (of people who share a common feature); gang; lot; bunch
電車の中はスマホ族ばかりだ。The train is full of the smartphone crowd.
3. tribe (taxonomic rank)
4. group (in the periodic table)