Definition of septcentenary in English:
septcentenary
nounPlural septcentenaries ˌsɛp(t)sɛnˈtɛn(ə)riˌsɛp(t)sɛnˈtiːn(ə)riˌsep(t)senˈtenərē
The seven-hundredth anniversary of a significant event.
七百周年纪念日
adjectiveˌsɛp(t)sɛnˈtɛn(ə)riˌsɛp(t)sɛnˈtiːn(ə)riˌsep(t)senˈtenərē
Relating to a seven-hundredth anniversary.
（与）七百周年纪念日（有关）的
Definition of septcentenary in US English:
septcentenary
nounˌsep(t)senˈtenərē
The seven-hundredth anniversary of a significant event.
七百周年纪念日
adjectiveˌsep(t)senˈtenərē
Relating to a seven-hundredth anniversary.
（与）七百周年纪念日（有关）的