second definition: 1. immediately after the first and before any others: 2. the position in which a person finishes a…. second synonyms, second pronunciation, second translation, English dictionary definition of second. Define second. How to use second nature in a sentence. b. How to use secondhand in a sentence. Definition and synonyms of second from the online English dictionary from Macmillan Education.. Find more ways to say second look, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Another word for second: next, following, succeeding, subsequent, sophomore | Collins English Thesaurus Second language definition, a language learned by a person after his or her native language, especially as a resident of an area where it is in general use. Another word for double meaning. Antonyms for second. See more. n. 1. a. Secondhand definition is - received from or through an intermediary : borrowed. This is the British English definition of second.View American English definition of second.. Change your default dictionary to American English. Learn more. See more. The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations. How to use second-rate in a sentence. Find more ways to say double meaning, along with related words, antonyms and example phrases at Thesaurus.com, the world's most trusted free thesaurus. Synonyms for second in Free Thesaurus. Synonyms for second of all include secondly, also, besides, furthermore, in addition, additionally, as well, further, on top of that and moreover. Second definition, next after the first; being the ordinal number for two. A unit of time equal to one sixtieth of a minute. Second-rate definition is - of second or inferior quality or value : mediocre. Second-guess definition is - to criticize or question actions or decisions of (someone) often after the results of those actions or decisions are known; also : to engage in such criticism of (an action or decision). Find more similar words at wordhippo.com! Second nature definition is - an acquired deeply ingrained habit or skill. Another word for second look. How to use second-guess in a sentence.