(transitive) To be, or act as, a grandfather to.

A father of someone's parent. / (by extension) A male forefather. / (computing) The archived older version of a file that immediately preceded the father file.

(transitive, chiefly US, law) To retain discontinued laws or rules for (a thing, person or organization previously affected by them).

simple past tense and past participle of grandfather

present participle of grandfather

Exemption from new legislation or regulations.

plural of grandfather

Third-person singular simple present indicative form of grandfather

plural of grandfathering

A clause or section, especially in a law, granting exceptions for people or organisations who were affected by previous conditions.