| REL | an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) |
|---|---|
| REL | a person related by blood or marriage |
| REL | not absolute or complete |
| REL | properly related in size or degree or other measurable characteristics |
| REL | (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12 |
| REL | a clause introduced by a relative pronoun |
| REL | the ratio of the density of something to the density of a standard |
| REL | the ratio of the number of observations in a statistical category to the total number of observations |
| REL | the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature |
| REL | the relative frequency of occurrence of something |
| REL | (in an election with more than 2 options) the number of votes for the candidate or party receiving the greatest number (but less that half of the votes) |
| REL | (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule |