Wordnet 3.0
NOUN (1)
1. 
 a fresh horse especially (formerly) to replace one killed or injured in battle; 
VERB (3)
1. 
 mount again; 
- Example: "he remounted his horse"2. 
 mount again, as after disassembling something; 
3. 
 provide with fresh horses; 
- Example: "remount a regiment"
The Collaborative International Dictionary of English v.0.48:
Remount \Re*mount"\ (r?-mount"), v. t. & i.
   To mount again.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Remount \Re*mount"\, n.
   The opportunity of, or things necessary for, remounting;
   specifically, a fresh horse, with his equipments; as, to give
   one a remount.
   [1913 Webster]
WordNet (r) 3.0 (2006):
remount
    n 1: a fresh horse especially (formerly) to replace one killed
         or injured in battle
    v 1: mount again; "he remounted his horse"
    2: mount again, as after disassembling something
    3: provide with fresh horses; "remount a regiment"