What is the meaning of Rennen?

to run, to move fast

plural of ren

to run; to race; to sprint (said of competing sportsmen, animals etc.) [auxiliary sein]

to run over (someone) [auxiliary haben]

Rōmaji transcription of れんねん

to run

to run, go, move; to travel; to flee

to ride (on horseback, on a chariot, etc.)

to hasten

to flow; pour forth, gush out

to proceed, continue, carry on

to pursue

to pass, elapse

to spread, become current

to be in effect, be valid

to coagulate, congeal

to pierce, penetrate

to ride (transport oneself on horseback) swiftly

Source: wiktionary.org