(abbreviative action or effect): In summarization: briefly, concisely, summarily, in short; to sum up
In order to deliver the news of Greek victory to Athens, Pheidippides covered the distance there from the plain of Marathon as quickly as his two legs could carry him, and did so without making any stops; in a word, he ran the entire distance.
Man, I got here by putting one foot in front of the other; in a word, I walked.
(cumulative action or effect): In summation: all in all, altogether, in total, overall, to sum up
He was suspicious, standoffish, taciturn; in a word, hostile.
Susan soon discovered her blind date to be mean, vulgar, obstreperous, presuming, and insulting; in a word, a cad.
It is the harmony of the diverse parts, their symmetry, their happy balance; in a word it is all that introduces order, all that gives unity, that permits us to see clearly and to comprehend at once both the ensemble and the details. Henri Poincaré
Tormented by the cursed ambition always to put a whole book in a page, a whole page in a sentence, and this sentence in a word. I am speaking of myself. Joseph Joubert
The national debt has given rise to joint stock companies, to dealings in negotiable effects of all kinds, and to agiotage, in a word to stock-exchange gambling and the modern bankocracy . Karl Marx
Civilization is built on a number of ultimate principles... respect for human life, the punishment of crimes against property and persons, the equality of all good citizens before the law... or, in a word justice. Max Nordau
Since the end of the period of belief, leaders exalt every defect, every kind of sadism, and gain all the more through their vices: vanity, ambition, war, death in a word. Louis-Ferdinand Céline
An answer in a word. Scottish Proverb