infinity

n.

1. The largest value that can be represented in a particular type of variable (register, memory location, data type, whatever).

2. minus infinity: The smallest such value, not necessarily or even usually the simple negation of plus infinity. In N-bit twos-complement arithmetic, infinity is $2^{N-1}$ but minus infinity is $-(2^{N-1}$, not $-(2^{N-1}$. Note also that this is different from time T equals minus infinity, which is closer to a mathematician's usage of infinity.