er, grand-]
| 1. | the father of one's father or mother. |
| 2. | a forefather. |
| 3. | the founder or originator of a family, species, type, etc.; the first of one's or its kind, or the one being longest in existence: the grandfather of all steam locomotives. |
| 4. | to exempt (something or someone) from new legislation, restrictions, or requirements: The law grandfathered all banks already operating at the time of passage. He was grandfathered into the pension plan. |