means A reader is a person who reads, or one who reads habitually and for pleasure — the silent partner every book is written for.

from From the verb "read," rooted in Old English "rǣdan," which meant far more than scanning words — it carried senses of advising, guiding, interpreting, even solving a riddle. To "read" was to counsel and to puzzle out meaning, so a "reader" was originally one who deciphered, not merely one who looked at letters. That older shadow lingers when we say someone is hard to "read" — and it links "read" to German "raten" (to advise or guess) and "Rätsel" (a riddle), distant cousins from the same Germanic stock.