The quality or state of being easterly; the characteristic of coming from or situated toward the east.
From 'easterly' plus '-ness' (state/quality). The entire word-family reveals how '-ness' transforms directional adjectives into abstract quality nouns.
Adding '-ness' to a direction word creates an almost philosophical abstraction—'easterliness' feels more abstract than just saying 'easterly,' suggesting we're discussing the essential 'eastness' of something.
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