An adoption in which the biological mother/biological parents and the adoptive family know each other's identities, and choose to remain in contact after the adoption process is finalized.

plural of open adoption

plural of opening ceremony

an incomplete electrical circuit through which no current can flow

plural of open circuit

(rare, mathematics, of a set) Being the interior of its closure.

A place of employment in which employment is in no way contingent on membership in a union, though a union may be the exclusive bargaining agent of the employees.

(religion) The practice of some Protestant churches to allow all people to take Communion, regardless of being members of the church or not.

(organic chemistry) Having carbon atoms arranged in a linear rather than cyclical chain.

(nonstandard) Alternative spelling of open mic