An Alzheimer patient's here may in his mind be anywhere he called home in the time he presently re-lives.
2
(abstract) This time, the present situation.
adjective
1
Filler after a noun or demonstrative pronoun, solely for emphasis.
John here is a rascal.
2
Filler after a demonstrative pronoun but before the noun it modifies, solely for emphasis.
This here orange is too sour.
adverb
1
(location) In, on, or at this place.
Flu season is here.
2
(location) To this place; used in place of the more dated hither.
Please come here.
3
(abstract) In this context.
Derivatives can refer to anything that is derived from something else, but here they refer specifically to functions that give the slope of the tangent line to a curve.
4
At this point in the argument, narration, or other, usually written, work.