Hypernyms (medication is a kind of...): drug (a substance that is used as a medicine or narcotic). Meronyms (substance of medication): physostigmine (used in treatment of Alzheimer's disease and glaucoma).
Definition of weather for English Language Learners. : the state of the air and atmosphere at a particular time and place : the temperature and other outside conditions (such as rain, cloudiness, etc.) at a particular time and place.
Climate is what we expect, and weather is what we get. Weather is what we get because it's how the atmosphere is behaving now, or will behave in the short-term (in the hours and days ahead). On the other hand, climate tells us how the atmosphere tends to behave over longer periods of time (months, seasons, and years). It does this based on weather's day-to-day behavior over a standard period of 30 years. This is why climate is described as what we expect in the above quote.