1. (adj.)concurrent occurring or existing simultaneously or side by side: serving two concurrent prison sentences.
2. concurrent acting in conjunction; cooperating: the concurrent efforts of medical researchers.
3. concurrent having equal authority or jurisdiction: concurrent courts of law.
4. concurrent accordant or agreeing.
5. concurrent intersecting or tending to intersect at the same point: four concurrent lines.
6. (n.)concurrent a concurrent action, process, effort, etc.
Etymology: (1375–1425; late ME (< MF) < L concurrent-, s. of concurrēns, prp. of concurrere to run together; see concur)
Definition of 'concurrent'
Princeton's WordNet
1. (adj)coincident, coincidental, coinciding, concurrent, co-occurrent, cooccurring, simultaneous occurring or operating at the sametime "a series of coincident events"
Definition of 'concurrent'
Webster Dictionary
1. (adj)concurrent acting in conjunction; agreeing in the same act or opinion; contributing to the sameevent or effect; cooperating
2. (adj)concurrent conjoined; associate; concomitant; existing or happening at the sametime
5. (noun)concurrent one who, or that which, concurs; a joint or contributory cause
6. (noun)concurrent one pursuing the same course, or seeking the same objects; hence, a rival; an opponent
7. (noun)concurrent one of the supernumerarydays of the yearover fifty-two complete weeks; -- so called because they concur with the solar cycle, the course of which they follow
Definitions of concurrent 
Afrikaans: gelyktydig, gelyklopend, 
Arabic: مُتَزامِن، مُتَوافِق
Bulgarian: едновременен
Brazilian: simultâneo
Czech: shodný, souběžný
German: übereinstimmend, gleichze
Danish: samtidig; sideløbende
Greek: ταυτόχρονος
Spanish: simultáneo
Estonian: samaaegne, kaasnev
Farsi: همزمان
Finnish: samanaikainen
French: simultané
Hebrew: חוֹפֵף
Hindi: समकालीन, एक साथ होने वाला
Croatian: istodoban, paralelan, ist
Hungarian: egyidejű; (meg)egyező, eg
Indonesian: simultan
Icelandic: sem gerist samhliða/samtí
Italian: coincidente
Japanese: 同時発生の
Korean: 동시에 발생하는
Lithuanian: sutampantis
Latvian: sakrītošs; vienlaicīgs
Malay: sekali
Dutch: samenvallend
Norwegian: samtidig, samstemmig, som
Polish: zbieżny, zgodny
Persian: همزمان
Pashto: همزمان
Portuguese: coincidente
Romanian: simultan
Russian: совпадающий
Slovak: zhodný
Slovenian: sočasen
Serbian: istovremen
Swedish: samstämmig, samtidig
Thai: ที่เห็นพ้องต้องกัน
Turkish: aynı zamanda meydana gele
Taiwanese: 同意的，同時發生的
Ukrainian: такий, що діє спільно; та
Urdu: بیک وقت ، ایک ساتھ
Vietnamese: đồng thời
Chinese: 同意的，同时发生的
