(medicine, dermatology) Loss of hair from the entire scalp, with normal hair elsewhere on the body remaining.

(medicine, dermatology) Loss of hair from the entire scalp and face.

plural of total base number

plural of path of totality

(astronomy) The path traced on the Earth's surface by the moon's shadow (more precisely, the umbra) during a total eclipse of the sun.

(set theory) Of a binary relation, to have every element of the left set occur at least once: ∀a∈A∃b∈B:(a,b)∈R⊆A⨯B

(set theory) Of a binary relation, to have every element of the right set occur at least once: ∀b∈B∃a∈A:(a,b)∈R⊆A⨯B