Quintuple VS
Synonym Boundary: "いち", "片道", "億", "いちいち", "相次いで"
All represent the core concept "one", but require precise selection.
Japanese Option A
いち
いち (ichi)
N5 / CEFR
Japanese Option B
片道
かたみち (katamichi)
N4 / CEFR
Japanese Option C
億
おく (oku)
N3 / CEFR
Japanese Option D
いちいち
いちいち (ichiichi)
N2 / CEFR
Japanese Option E
相次いで
あいついで (aitsuide)
N2 / CEFR
Quintuple VS Nuance Contrast & Social Differences
When expressing "one" in Japanese, you must carefully distinguish between "いち", "片道", "億", "いちいち", "相次いで" based on context.
- いち (いち (ichi) - Level: N5): Maps to "one" and is used when Basic number for counting. Can be used as a standalone number or with various counters.
- 片道 (かたみち (katamichi) - Level: N4): Maps to "one way, single trip" and is used when Describes a journey to a destination without returning. Often used with きっぷ.
- 億 (おく (oku) - Level: N3): Maps to "one hundred million (100,000,000)" and is used when A large numerical unit in Japanese. 1億 = 100,000,000. Often used for large amounts of money, population, or astronomical figures..
- いちいち (いちいち (ichiichi) - Level: N2): Maps to "one by one; in detail; item by item; minutely; every single time (often implies annoyance or unnecessary thoroughness)" and is used when Implies going through things individually or paying attention to every small detail. Can convey a sense of annoyance when someone is being excessively meticulous or complaining about every little thing..
- 相次いで (あいついで (aitsuide) - Level: N2): Maps to "one after another; in succession" and is used when Describes multiple events or incidents happening consecutively. Often used for significant or repeated occurrences..
Context for "いち"
りんごが一つあります。
There is one apple.
Context for "片道"
彼は飛行機の片道チケットしか持っていませんでした。
He only had a one-way flight ticket.
Context for "億"
日本の人口は約1億2千万です。
Japan's population is approximately 120 million.
Context for "いちいち"
彼は部下のやることに、いちいち口を出す。
He interferes with every single thing his subordinates do.
Context for "相次いで"
事故が相次いで発生した。
Accidents occurred one after another.
Synonym Mastery Challenge
Which Japanese word perfectly fits this blank space?
Fill in the blank: "りんごが一つあります。" (Meaning: "There is one apple.")
🎉 Correct Answer!
Remember: "いち" is correct here because it represents "one" in the context: "There is one apple.".