point of reference

:  an individual detail :  item

:  a distinguishing detail

:  the most important essential in a discussion or matter

:  to furnish with a point :  sharpen

:  to give added force, emphasis, or piquancy to

:  to scratch out the old mortar from the joints of (something, such as a brick wall) and fill in with new material

:  the act of referring or consulting

:  a bearing on a matter :  relation

:  something that refers: such as

:  used or usable for reference

:  constituting a standard for measuring or constructing

:  to supply with references

:  to cite in or as a reference

:  to put in a form (such as a table) adapted to easy reference