Preboard Definition
 prēbôrd 
  preboards
  
    verb
  
 To board (an aircraft, for example) ahead of the regular time or before other passengers.
 American Heritage 
To allow (one or more passengers) to board ahead of the regular time or before other passengers.
 American Heritage 
To board an aircraft or other conveyance ahead of the regular time or before other passengers.
 American Heritage 
Origin of Preboard
-  pre- +"Ž board From Wiktionary 
Preboard Is Also Mentioned In
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