Word #700 01010111011

first — BIP39 word #700

"first" is word #700 of the 2048 words in the official BIP39 English wordlist, between firm and fiscal. In a seed phrase it stands for the 11-bit value 01010111011, decimal index 699.

/fɜːst/ · adjective: coming before all others in time, order or importance

Russian: первый

Binary Representation

Seven 1-bits and four 0-bits; 330 of the 2048 indexes have exactly seven 1-bits.

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

student blast jazz electric garage fat fever filter fitness fire firm

Position

#700 of 2048

Hex Index

0x2BB

4-Letter Prefix

firs

About "first" in BIP39

"first" has 5 letters, but the first four, "firs", already identify it, because "fir" also begins fire and firm.
"first" appears in one of the 24 official English test vectors of BIP39: vector #21 (word 4 of 24). Every official vector passes the checksum checker, and How BIP39 works shows how the entropy turns into such words.

Official test vector #21

all hour make first leader extend hole alien behind guard gospel lava path output census museum junior mass reopen famous sing advance salt reform