Order book official = een order book official of obo is een functionaris op de optiebeurs die toeziet op het correct verlopen van de handel. De order book official houdt tevens het. Used as an adjective, something "official" refers to something endowed with governmental or other authoritative recognition or mandate, as in official language, official gazette, or official.
The meaning of official is one who holds or is invested with an office : How to use official in a sentence. Definition of official adjective in oxford advanced learner's dictionary.
See examples of official used in a sentence. An official is a person who holds a position of authority or responsibility in a government, organization, institution, or corporation. If something is official, it's authorized and approved by somebody.
If gatorade is the official drink of the olympics, somebody with authority has signed some papers and a deal has been made.