Register
Etymology
From Medieval Latin registrum, "a list, record," from Late Latin regesta ("things recorded"), from regerere ("to record, carry back"): re- ("back") + gerere ("to carry"). The everyday meaning is a written record or range. Linguists borrowed it in the mid-twentieth century for the "range" of styles a speaker can move through, from casual to ceremonial.
noun · /REJ-ih-stur/
The level of formality and style a speaker adopts to fit a particular situation or audience.
What it names
The dial we all turn between "hey, what’s up" and "Dear Sir or Madam" — the fact that competent speakers command several ways of saying the same thing.
Example
He misjudged the register of the toast, cracking locker-room jokes at a corporate retirement dinner.
Related idea
Dialect is the variety tied to who you are — your region or group; register is the variety tied to the situation you’re in. One person shifts register all day but keeps a single dialect.
verb · /REJ-ih-stur/
To become consciously noticed or understood; to make an impression on the mind.
What it names
The moment information actually lands — 'the warning didn't register' — distinct from formally recording something or the linguistic level of formality.
Example
I heard the words, but their meaning didn't register until hours later.
Related idea
It marks the instant something lands in the mind — 'the warning didn't register' — closer to sinking in than to formally recording a name or the linguistic level of formality.
noun · /REJ-ih-stur/
An official written list or record — and, as a cash register, the machine that records sales.
What it names
A formal, kept record: a register of voters, births, or guests, or the till that logs each transaction.
Example
The hotel asked every guest to sign the register.
Related idea
Unlike the ‘level of formality’ sense, this register is a physical or official ledger — a record you enter names or numbers into, not a style of speech.
noun · /REJ-ih-stur/
The range of pitches a voice or instrument can produce, or a distinct part of that range.
What it names
A band of the pitch spectrum — the ‘head’ or ‘chest’ register of a singer, the low register of a cello.
Example
The melody sits in the soprano’s upper register.
Related idea
An octave is a fixed interval between two pitches; a register is a broad zone of the range with its own tonal character, closer to timbre than to a measured distance.