Learn more. How to use second-rate in a sentence. This is the British English definition of second.View American English definition of second.. Change your default dictionary to American English. 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). Another word for double meaning. Definition and synonyms of second from the online English dictionary from Macmillan Education.. How to use secondhand in a sentence. The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations. 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. How to use second nature in a sentence. Another word for second look. How to use second-guess in a sentence. second synonyms, second pronunciation, second translation, English dictionary definition of second. See more. b. n. 1. a. Antonyms for second. Synonyms for second of all include secondly, also, besides, furthermore, in addition, additionally, as well, further, on top of that and moreover. Second nature definition is - an acquired deeply ingrained habit or skill. Define second. Another word for second: next, following, succeeding, subsequent, sophomore | Collins English Thesaurus second definition: 1. immediately after the first and before any others: 2. the position in which a person finishes a…. 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. 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. Second definition, next after the first; being the ordinal number for two. Secondhand definition is - received from or through an intermediary : borrowed. Find more similar words at wordhippo.com! Second-rate definition is - of second or inferior quality or value : mediocre. A unit of time equal to one sixtieth of a minute. See more. Synonyms for second in Free Thesaurus.