せい
sei

Noun
no-Adjective

1. (logical) true; regular

Numeric

2. 10^40; ten duodecillion

Noun
no-Adjective

3. original

Abbreviation
Related to 正本【せいほん】
Noun
no-Adjective

4. positive; greater than zero

Mathematics
Related to 負【ふ】
Noun

5. thesis (in dialectics)

Philosophy
Related to 定立正反合