How to say "longitude" in Japanese

• 経度けいどJLPT N2approx.Common
  nounThe common word for longitude as a geographic coordinate — angular distance east or west of the prime meridian. Use it when stating or asking for a position's longitude, as in maps, navigation, or location data.
  赤道せきどうにおける経度けいど1度ど当あたりの長ながさ。↗

  Distance per degree of longitude at equator.
• 経線けいせん
  no-adjectiveA less common word: it covers longitude in the sense of a meridian line on a globe or map, not a coordinate value. For the coordinate itself, 経度 is the word.
• 経けい
  nounA less common single-character word for longitude. On its own it is seldom the word you want; for ordinary use, 経度 is the common term.

Use 経度 for longitude as a geographic coordinate; 経線 means a meridian line rather than a reading, and 経 alone is a less common, marginal variant — for ordinary purposes 経度 is the safe choice.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 経度けいどlongitude
• 経線けいせんmeridian
• 経けいlongitude