Longman Dictionary of Contemporary English - reckon

~ v 1 spoken especially BrE to think that something is a fact, or have a particular opinion about something  (reckon (that))  (Wayne reckons we ought to call her. | Do you reckon they'll get married?) 2 to guess a number or amount, without calculating it exactly  (reckon how much/how many etc)  (How much do you reckon she earns? | reckon sth to be sth)  (The likely cost of the system is reckoned to be about -10,000. | be reckoned in thousands/millions)  (Her personal fortune is reckoned in millions.) 3 formal to think that someone or something is a particular kind of person or thing  (be reckoned to be sth)  (Julia is often reckoned to be the most beautiful woman in Hollywood. | reckon sb among/as)  (I reckon him among my friends.) 4 formal to calculate an amount  (My pay is reckoned from the first of the month.) reckon sth in phr v to include something when you are calculating  (Have you reckoned in the cost of postage?) reckon on sth phr v to expect something to happen when you are making plans  (reckon on doing sth)  (We didn't reckon on spending so much on repairs.) reckon sth up phr v old-fashioned to add up an amount, cost etc, in order to get a total  (Can you reckon up the money we've made?) reckon with sb/sth phr v 1 not reckon with to not consider a possible problem when you are making plans  (We hadn't reckoned with the possibility that it might rain.) 2 sb/sth to be reckoned with something or someone that is powerful and must be regarded seriously as a possible opponent, competitor, danger etc  (The principal was certainly a woman to be reckoned with.) 3 have sb/sth to reckon with to have to deal with someone or something powerful  (Any invader would have the military might of NATO to reckon with.) reckon without sb/sth phr v BrE to not consider a possible problem when you are making plans  (We had reckoned without the difficulty of selling the house.)