nee
Once.
to swarm all at once
quick, speedy, at once
anniversary is a synonym for it.
Each/every/once a year.
double, doubly, once over, over again, twofold
Fargo was once named "Centralia" before it was renamed to Fargo in 1872.
once upon a time there was a girl named angelica
It was once named Tenochtitlan, until the Spanish re-named it Mexico City.
Because if you gave more than one side the same letter - it would get confusing !
The letter N -- although, strictly speaking, the letter N does occur once in "an hour."
None do. Any meteor is seen only once, generally for not more than a few seconds. For that reason, they're not named.