Adjective 1. towards the side exposed to wind (synonym) weather(a) (similar) windward Adverb 1. toward the wind; "they were sailing leeward" (synonym) leeward (antonym) windward, downwind 2. in the direction opposite to the direction the wind is blowing; "they flew upwind" (synonym) against the wind, into the wind (antonym) downwind, with the wind
Windward is the direction upwind (toward where the wind is coming from) from the point of reference. Leeward is the direction downwind (or downward) from the point of reference. The side of a ship that is towards the leeward is its lee side. If the vessel is heeling under the pressure of the wind, this will be the "lower side". During the age of sail, the term weather was used as a synonym for windward in some contexts, as in the weather gage.