noun, feminine/sə.ɡɔ̃d/plural: secondes
second (for indicating time); second (interval between two adjacent notes in a diatonic scale)
“Quelqu'un quelque part au bout du monde qui pense à la même seconde à la même chose que moi” — Someone somewhere at the end of the world who thinks at the same second of the same thing as me
The first sense is a borrowing from Latin (minuta) secunda.