Quindecillion means: 1048.. It is mainly Australian English and may not be understood outside that context. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
quindecillion
(rare, US, modern, _, British, and, Australian, _, w:Long and short scales, short scale) 1048.
ˌkwɪndəˈsɪl.i.ənDocumented since 1700shistorical65 viewsLast reviewed Jun 29, 2026＋ Add a definition
Etymology timeline
Born ~1700 · no dated citations yet18th centurySee decade cohort →
Definitions
UK
#1·Apr 27, 2026UK
(rare, US, modern, _, British, and, Australian, _, w:Long and short scales, short scale) 1048.
For parents
Quindecillion means: 1048.. It is mainly Australian English and may not be understood outside that context. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
For ESL learners
quindecillion means: 1048.. Register: informal, Australian English. Often not understood outside its region; gloss the word on first use when writing for an international audience. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.
Cluster: general
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UK
#2·Apr 27, 2026UK
(rare, dated, British, _, &, _, Australian, w:Long and short scales, long scale) 1090.
: 3 quindecillion, 657 quattuordecillion, 262 tredecillion; which is to say the figures 3,657,262 followed by 42 ciphers. Operators of the key punch machines transfer a code symbol from the Census [...].
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For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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UK
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🇦🇺About Australian & NZ slang slang
Aussie and Kiwi vocabulary — bogan, daggy, brekkie, sheila, bach, jandals — the whole Antipodean lexicon, including outback dialect, surf and beach culture, and Sydney/Melbourne street slang.
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