If you feel loyal and loving toward someone or something, that's devotion. If your devotion to your pet hamster truly knows no limits, you might splurge on a solid-gold hamster wheel.
Devotion also means a commitment or dedication to some purpose. Your devotion recycling is noble, but can you wait until I've read the newspaper? The plural noun devotions can have a religious meaning too, meaning prayers offered to God. You heard the minister was hired for his devotion to God, but the fact that he fell asleep during devotions made you wonder.