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as
adverb
Used to indicate degree, extent, or manner of comparison; introduces clauses of time, reason, or manner. Functions as a conjunction meaning 'while', 'when', or 'because,' or as an adverb meaning 'to the same degree'.
Etymology
Origin: Old English
Root: eallswā — "movement to or toward; in addition to"
Example
"As the storm intensified, the travelers realized they were not as prepared as they had thought."
Usage Notes
Extremely versatile word with multiple grammatical functions. As conjunction: 'As I walked, it rained.' As adverb in comparisons: 'as tall as.' Can indicate simultaneous action, cause, or manner. Common error: avoid redundant 'as...as' constructions like 'equally as good' (should be 'equally good' or 'as good as'). Register: completely neutral, used across all contexts.