round has 34 distinct synonyms spread across 19 of its 25 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is square.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an interval during which a recurring sequence of events occurs
“the never-ending cycle of the seasons”
(often plural) a series of professional calls (usually in a set order)
“the doctor goes on his rounds first thing every morning”
the activity of playing 18 holes of golf
“a round of golf takes about 4 hours”
the usual activities in your day
“the doctor made his rounds”
the course along which communications spread
“the story is going the rounds in Washington”
a serving to each of a group (usually alcoholic)
“he ordered a second round”
a cut of beef between the rump and the lower leg
an outburst of applause
“there was a round of applause”
any circular or rotating mechanism
“the machine punched out metal circles”
wind around; move along a circular course
“round the bend”
1 of the 25 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for round.
Synonyms, antonyms and the broader and narrower relations for round come from Princeton University’s WordNet. Full sources and licences.
express as a round number
“round off the amount”