Here are some possibilities:
* A garland: This is the most common meaning. It refers to a floral garland, typically worn around the neck or head during ceremonies or celebrations.
* A type of jewelry: Ponnadai can also refer to a type of traditional gold jewelry, especially a necklace with a specific design.
* A ceremony: In some contexts, "ponnadai" might refer to a ceremony itself, like a wedding ceremony or a religious ceremony where garlands are exchanged.
To provide a more accurate translation, I need more context. Please tell me where you encountered the word "ponnadai" and what the surrounding text or situation is.