Progression.
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It is a 'term'
SEGUENCE is not a word, however SEQUENCE is. Sequence means "the following of one thing after another; succession."
An ordered list of numbers is a sequence
It is the sequence of first differences. If these are all the same (but not 0), then the original sequence is a linear arithmetic sequence. That is, a sequence whose nth term is of the form t(n) = an + b
Well, it would depend what the sequence was...? If the sequence was 2,4,6,8,10,12,14,16,18,20, then the 9th term would be 18!