00More optionsShareSaveReportVideo vocabularyNo vocabulary matches your filtersfortressUS /ˈfɔ:rtrəs/・UK /ˈfɔ:trəs/Countable NounMilitary buildings providing protectionB2More familyUS /ˈfæmli/・UK /'fæməlɪ/Noun (Countable/Uncountable)Close group of people or organizationsA group of people who are related through bloodA1More Use EnergyUnlock All VocabularyUnlock pronunciation, explanations, and filtersUnlock