I'm looking for a word to describe the second one in 2 things (in a situation the the first one was mentioned previously)
adjective
...
2. denoting the second or second mentioned of two people or things.
"the Russians could advance into either Germany or Austria—they chose the latter option"
synonyms: last-mentioned, second-mentioned, second of the two, second, last, later
The word you're looking for is "latter." In a sentence, this refers to the second of two items listed. The word for the first item listed is, "former."
Example: I like to have granola or cereal for breakfast. The former is my favorite, but, the latter has more variety
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Welcome to ELU. Your suggestion may be valid and very useful; it could be made even better with a cited definition or source to back it up. For future reference, it's always a good idea to include some evidence with your answers. – JHCL Oct 20 '15 at 13:59