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- second difference
- second differential
- second differential parameter
- second differentiator
- second distance
- second dual
- second dual module
- second dual space
- second economics adjustment of China
- second eigenfunction
- second electron emission
- Second Emperor of Qin Dynasty
- Second Empire of Brazil
- second factor
- second fall-line
- second Fermat point
- second field free region
- second field-free region
- second field free region (2nd FFR)
- second field-free region (2nd FFR)
- second filial generation
- second five-year plan of China
- second form of barycentric Lagrange interpolation formula
- second fundamental form
- second fundamental quantity