(av (ǝ) rij): A value that is computed by dividing the sum of a set of terms by the number of terms.

(dā tǝ or da tǝ): Factual information (such as measurements or statistics) used as a basis for reasoning, discussion, or calculation.

(ē kə lä ji kəl): Of or relating to the environments of living things or to the relationships between living things and their environments.

(i kä lǝ gē): A branch of science concerned with the relationships between living things and their environment.

(ē kō sis tǝm): A system made up of an ecological community of living things interacting with their environment especially under natural conditions.

(e də bəl): Fit to be eaten.

(hyü məd): Damp, moist.

(in vā siv): Tending to spread especially in a quick or aggressive manner, such as a nonnative species growing and dispersing easily, usually to the detriment of native species and ecosystems.

(lär ve): (plural “larvae”) The immature, wingless, and often wormlike feeding form that hatches from the egg of many insects.

(nu̇ mer ik): Having to do with numbers or a system of numbers.

(rən ȯf): Water from rain or snow that flows over the surface of the ground and finally into streams.

(spē sēz or spē shēz): A category of living things that ranks below a genus, is made up of related individuals able to produce fertile offspring, and is identified by a two-part scientific name.