| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| IFR conditions | Geography | According to visual flight rules, weather conditions that are below the minimum stipulated for flight. Source: European Union. (references) | |
| IFR conditions | Technology | Weather conditions below the minimum for flight under visual flight rules. See INSTRUMENT METEOROLOGICAL CONDITIONS. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||