Distance measures in cosmology

Formulae for the line-of-sight and transverse comoving distances, proper motion distance, angular diameter distance, luminosity distance, k-correction, distance modulus, comoving volume, lookback time, age, and object intersection probability are all given, some with justifications. Some attempt is made to rationalize disparate terminologies, or at least abuse bad usage.Comment: This short and purely pedagogical text is not submitted anywhere but here. Errors reported to the author will be rewarded with gratitude and acknowledgement