This is the verse translation, not a definition of the individual word.
Whatever matter you [O Prophet] may be engaged in, and whatever portion of the Qur’an you may recite, and whatever deed you [O people] may do, We are a Witness over you when you are engaged in it. Nothing is hidden from your Lord, not even an atom’s weight on earth nor in heaven, nor anything smaller or greater than that, except that it is [written] in a clear Record[1].
Source
[1] It soothes and assuages the believing community; that their deeds are recorded and that they are more successful side.