multisecular UK /ˌmʌltiˈsɛkjələ/US /ˌmʌltiˈsɛkjəlɚ/ adjective1 •(literary, rare) Of or related to a span of several centuries, centuries-old.[…] the multisecular stability of its primeval basin […] — 1922 formsmore multisecular · most multisecular
