the best or most desirable

movement, from side to side at a steady speed; a frequent change in size, strength, or direction between two limits

how much is spent on things; the process of eating and drinking

that is to say, specifically

something that happens on its own, seemingly without cause

action making something harder to do something

the study of a system, such as the system of words in a sentence

the degree to which people or things are the same

an idea or notion; the first stage in pregnancy

concerning atoms