Prefix Definition & Meaning | Britannica Dictionary (original) (raw)

Britannica Dictionary definition of PREFIX

[count]

1

:

a letter or group of letters that is added at the beginning of a word to change its meaning

• Add the prefix “re-” to form the words “retell” and “recall.”

— compare affix, suffix

2

old-fashioned

:

a title (such as “Mr.” or “Dr.”) that is used before a person's name

Britannica Dictionary definition of PREFIX

[+ object]

:

to add a letter, number, or symbol at the beginning of a word or number

• Prefix “un” to “do” to form the word “undo.”
• The cost of the item was prefixed by/with a dollar sign.