Jon's Random Tidbits of English Knowledge

Here's where I put things that I'm likely to forget how to do next time I need to do them. If they can be of help to someone else, great, but they are mostly for me.

Inter vs. Intra

Inter- means "between, among, shared among two or more," and the like: interplanetary travel, interfaith ceremonies, intercity buses.
Intra- means "within, inside, during": intracity school competition, intrastate transportation, intrauterine devices.

Affect vs. Effect

Affect is a verb
Effect is usually a noun

Accuracy vs. Precision

Accuracy is nearness to truth (eg. hitting bull's eye).
Precision is nearness of repeated measurements to each other (eg. hitting all the same spot). Systematic adjustments can then be used to acheive accuracy.