How to say "concurrent" in Japanese

• コンカレント
  prenominal modifierA katakana loanword that directly transcribes 'concurrent'. Being less common, it is seldom the word you reach for; for most senses of 'concurrent', 同時 is the safer, more natural choice.
• 同時どうじJLPT N3approx.Common
  prenominal modifierThe common, general word for the 'at the same time' sense: use it when two or more things happen, or are done, simultaneously or concurrently. It also covers 'synchronous'.
• マルチタスク
  na-adjective, nounReally means 'multitasking'. Use it for 'concurrent' only in the sense of juggling several tasks or activities at once; for events that simply happen at the same time, 同時 is the better fit.

Choose the common 同時 for the general 'at the same time' sense of 'concurrent'; 「マルチタスク」 only for juggling several tasks at once; 「コンカレント」 is a less common loanword that simply transcribes the English word.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• コンカレントconcurrent
• 同時どうじsimultaneous
• マルチタスクmultitasking (person)