sane

Short definition from Wiktionary

Adjective

1. 1
   Being in a healthy condition; not deranged; thinking rationally.
2. 2
   Mentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge the effect of one's actions in an ordinary manner.
3. 3
   Rational; reasonable; sensible.
4. 4
   Acronym of standard and normal evolution.

Noun

1. 1
   Initialism of sexual assault nurse examiner.
2. 2
   Ellipsis of SANE disc, a type of black hole accretion disc.