---
title: "BIP39 Word #1366: primary — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/primary/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #1366 10101010101 

# primary — BIP39 word #1366

"**primary**" is word #1366 of the 2048 words in the official BIP39 English wordlist, between [pride](/bip39-word/pride/) and [print](/bip39-word/print/). In a seed phrase it stands for the 11-bit value `10101010101`, decimal index 1365\. 

/ˈpraɪməri/  · _adjective:_ most important or main, or coming first 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): основной 

## Binary Representation

Six 1-bits and five 0-bits; 462 of the 2048 indexes have exactly six 1-bits.

One wrong bit turns it into (leftmost bit first):

[click](/bip39-word/click/)[turkey](/bip39-word/turkey/)[melt](/bip39-word/melt/)[rival](/bip39-word/rival/)[pencil](/bip39-word/pencil/)[push](/bip39-word/push/)[post](/bip39-word/post/)[produce](/bip39-word/produce/)[pretty](/bip39-word/pretty/)[priority](/bip39-word/priority/)[pride](/bip39-word/pride/) 

Position

Hex Index

0x555

4-Letter Prefix

prim

## About "primary" in BIP39

- "primary" has 7 letters, but the first four, **"prim"**, already identify it, because **"pri"** also begins 7 other words, among them [price](/bip39-word/price/), [pride](/bip39-word/pride/), [print](/bip39-word/print/) and [priority](/bip39-word/priority/).
- **"prim"** is unique only within the English list: it also begins primitif in the [French list](/french/), primo in the [Spanish list](/spanish/), prima in the [Italian list](/italian/) and primata in the [Portuguese list](/portuguese/), so a four-letter backup should say which list it uses.
- "primary" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #24 (word 10 of 24). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words.

Official test vector #24

[void](/bip39-word/void/) [come](/bip39-word/come/) [effort](/bip39-word/effort/) [suffer](/bip39-word/suffer/) [camp](/bip39-word/camp/) [survey](/bip39-word/survey/) [warrior](/bip39-word/warrior/) [heavy](/bip39-word/heavy/) [shoot](/bip39-word/shoot/) primary [clutch](/bip39-word/clutch/) [crush](/bip39-word/crush/) [open](/bip39-word/open/) [amazing](/bip39-word/amazing/) [screen](/bip39-word/screen/) [patrol](/bip39-word/patrol/) [group](/bip39-word/group/) [space](/bip39-word/space/) [point](/bip39-word/point/) [ten](/bip39-word/ten/) [exist](/bip39-word/exist/) [slush](/bip39-word/slush/) [involve](/bip39-word/involve/) [unfold](/bip39-word/unfold/) 

## Word #1366 in the Other 9 BIP39 Wordlists

[Czech](/czech/) ptactvo 

[French](/french/) officier 

[Italian](/italian/) prugna 

[Japanese](/japanese/) ともる 

[Korean](/korean/) 인체 

[Portuguese](/portuguese/) nuvem 

[Spanish](/spanish/) papel 

[Traditional Chinese](/chinese-traditional/) 琴 

[Simplified Chinese](/chinese-simplified/) 琴 

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "pri":

[price](/bip39-word/price/)[pride](/bip39-word/pride/)[print](/bip39-word/print/)[priority](/bip39-word/priority/)[prison](/bip39-word/prison/)[private](/bip39-word/private/)[prize](/bip39-word/prize/) 

## More BIP39 Words Starting with "P"

[ #1362 pretty ](/bip39-word/pretty/)[ #1363 prevent ](/bip39-word/prevent/)[ #1364 price ](/bip39-word/price/)[ #1365 pride ](/bip39-word/pride/)[ #1367 print ](/bip39-word/print/)[ #1368 priority ](/bip39-word/priority/)[ #1369 prison ](/bip39-word/prison/)[ #1370 private ](/bip39-word/private/) 

[View all words starting with "P" ](/bip39-words/p/) 

## Seed phrase, key and recovery guides

- [BIP 32 Explained: Hierarchical Deterministic Wallets](/bip-32/)
- [Can You Guess a Seed Phrase? Probability and Real Risks](/can-you-guess-a-seed-phrase-probability-and-real-risks/)
- [Crypto Inheritance: How to Pass On Your Seed Phrase](/crypto-inheritance/)

[ Full BIP39 Wordlist ](/)