INSTRUMENT – a formal document such as a deed or a will
Merriam-Webster Online Dictionary
instrument (noun)1.
a device used to produce music , also a singing voice
2.
a) a means whereby something is achieved, performed, or furthered
b) one used by another as a means or aid - dupe tool
3.
- implement , especially one designed for precision work
4.
a formal legal document (as a deed, bond, or agreement)
5.
a) a measuring device for determining the present value of a quantity under observation
b) an electrical or mechanical device used in navigating an airplane , especially such a device used as the sole means of navigating implement
transitive verb
1.
to address a legal instrument to
2.
to score for musical performance - orchestrate
3.
to equip with especially for measuring and recording data - instruments