Formal:
* அக்கா (akka): This is the most common and respectful way to address your elder sister. It is used in most situations, regardless of age difference.
* அண்ணி (anni): This is a more formal way to address your elder sister, especially if she is married.
Informal:
* அக்கா (akka): This is also used informally, often with a term of endearment like "அன்பான அக்கா" (anbaan akka, "dear sister").
* அக்கம்மா (akkammaa): This is a more affectionate way to address your elder sister, often used by younger siblings.
* அக்காடி (akkaadi): This is a more playful and informal way to address your elder sister, often used by siblings who are close in age.
Other options:
* தங்கை (thanga): This literally means "younger sister," but it can be used to address an elder sister in a playful way.
* செல்லம் (sellam): This means "darling" and can be used to address your sister affectionately.
The best way to address your elder sister in Tamil is to use the term that you are most comfortable with and that is appropriate for the situation.