v.
      - calculate.
- be of the opinion.
- regard in a specified way. ▸
(reckon someone/thing among)
 include someone or something in (a group). ▸
(reckon on/to)
 informal have a specified view or opinion of. 
- 
(reckon on)
 rely on or be sure of. ▸expect. 
- 
(reckon with (or without))
 take (or fail to take) into account.
- 
(reckon with)
 archaic settle accounts with.
Phrase
  
    
      - a —— to be reckoned with 
(or to reckon with)
 a thing or person not to be ignored or underestimated.
 
  Etymology
  OE (orig. ‘give an account of items received’, hence the notion of ‘calculation’) (ge)recenian ‘recount, relate’, of W. Gmc origin.