A legal principle requiring judicial proceedings to be conducted in a transparent manner and with the oversight of the people, so as to safeguard the rights of those subject to the power of the court and to allow for the scrutiny of the public in general.

(military, international law) A city which has announced it has abandoned all defensive efforts, generally in the event of the imminent capture.

(chess) Open Game

present participle of open a can of whoop ass

(computing) a proxy server that may be accessed by any Internet user

(mathematics) A half space that does not include the plane that bounds it

(genetics) A sequence of DNA triplets, between the initiator and terminator codons, that can be transcribed into mRNA and later translated into protein.

An electronic device used to open a garage door remotely.

(finance) A collective investment scheme which can issue and redeem shares at any time.

(idiomatic) To remain vigilant for someone or something. / (idiomatic) To remain vigilant for a possibly dangerous situation.