closed loop closed interval • closed primary · · · Info · Definitions · Synonyms · Characters · · closed loop · · Text Common · · Latin · · Scripts 11 · · Length 2 · · Syllables Definitions · · · (noun) a control system with a feedback loop that is active. Synonyms: closed loop, closed-loop system. · · Noun Definition 1 Synonyms · · · closed-loop system · · Synonym 1 Characters · · space U+0020 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073