Second
noun, suffix
The kanji and the word are exactly the same. That means they share meanings as well - that is the unit of time, second.
The reading is the same as you learned with the kanji. It's presumably because it's usually attached to other things, like numbers, making it act more like a jukugo word would. Anyway, you should only need a second to learn this reading, since you should already know it.
一秒
one second
六十秒
sixty seconds
十秒
ten seconds
コウイチにラインしたら秒で返事きたw
I sent a LINE message to Koichi and he replied to me in a second lol.
大体いつも、ふとんに入ったら三秒でねてる。
When I go to bed, I usually fall asleep in three seconds.
あなたの発音をたったの十二秒でネイティブレベルにしてみせますよ。
Your pronunciation can reach native-level in just twelve seconds.