1. a word or phrase in which no letter of the alphabet occurs more than once
Usage: linguistics; word games
2. a line on a map connecting points of equal value (such as temperature or pressure)
Usage: cartography; meteorology

Examples

• The word 'background' is an isogram because each letter appears only once.
• In word games like Scrabble, finding isograms can be a useful strategy.
• Meteorologists use isograms on weather maps to show areas of equal temperature.
• The isogram on the map indicated regions with the same atmospheric pressure.
• 'Uncopyrightable' is a famous isogram used in word puzzles.