Another term is kaLai, which refers to using multiple beats in one beat. Thus 2nd kaLai of aadi taaLam will use 2 beats for every one beat of the taaLam. This is noticeable in the speed of the song and the length of the aavartanam (cycle of the taaLam).
EDuppuIn some cases, the taaLam doesn't "begin" on the beginning of the first beat (called the samam). It may begin just 1/2 beat before or after, or 1 1/2 beat after, for example. The place where a particular section of a song (anupallavi, pallavi, or charaNam) begins in the taaLam is called the graham or eDuppu.