as of

preposition

Definition of as of 

: on, at, from used to indicate a time or date at which something begins or ends takes effect as of July 1

First Known Use of as of

1900, in the meaning defined above

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The first known use of as of was in 1900

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as of

preposition

Kids Definition of as of

: on entry 1 sense 5, at We begin work as of Tuesday.

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lying above or upon

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