Quick answer
Sennight means a period of seven nights; one week. It is usually pronounced SEN-night, and today it is still readable to modern audiences, even if it sounds more deliberate than everyday speech.
Word page
Sennight
Sennight means a period of seven nights; one week. It belongs to archaic and forgotten words and works best in historical fiction, mock-Elizabethan insults, and old-fashioned comic prose. It still feels usable today, especially when you want a word with more character than the plainest alternative.
At a glance
archaicold-fashionedliterary
How to say it
Meaning in plain English
In plain English, sennight refers to a period of seven nights; one week. It is most useful when a plain label would tell the truth but miss the tone, flavor, or comic edge.
Why this word feels absurd
Sennight feels absurd because it has more texture than the plain alternative, giving the idea an extra bit of theatrical, comic, or overbuilt energy.
Origin and history
Sennight is generally traced to old English. In modern use, the history matters less than the strong tone the word still carries.
Is this word still used today?
Sennight is still usable today, especially when you want language that feels more distinctive than the plainest modern alternative.
Example sentences
- The letter promised a reply within a sennight.
- In the diary, the fair was expected to last a full sennight.
- Using sennight in conversation is a quick way to reveal that you enjoy old words.
- The editor kept the archaic term sennight to preserve the period flavor.
When should you use this word?
Use sennight when you want a more vivid, characterful choice than the plain everyday alternative. It works especially well in historical fiction, mock-Elizabethan insults, and old-fashioned comic prose.
Similar words
Week, Fortnight, Seven-day period, Calendar week
Opposite or contrasting words
Day, Month, Fortnight
Common questions
- What does sennight mean? A period of seven nights; one week.
- How do you pronounce sennight? It is commonly pronounced SEN-night.
- Is sennight still used today? Sennight is still usable today, especially when you want language that feels more distinctive than the plainest modern alternative.
- When should you use sennight? Use sennight when you want a more vivid, characterful choice than the plain everyday alternative. It works especially well in historical fiction, mock-Elizabethan insults, and old-fashioned comic prose.
- What words are similar to sennight? Similar words include Week, Fortnight, Seven-day period, and Calendar week.
Editorial note
Edited by Absurd Words. Last updated: May 9, 2026. See the editorial policy for how definitions, examples, labels, and update checks are handled on the site.