love letter

Short definition from Wiktionary

Noun

1. 1
   A letter written to express the author's love for the intended reader.
2. 2
   A work that shows great passion or enthusiasm for something.
3. 3
   A notice from the U.S. Customs and Border Protection informing about the seizure of a personal shipment as contraband.
4. 4
   A thin snack of crisp baked dough eaten at Chinese New Year.