on

adj

By · According to Wiktionary data (CC BY-SA) ·

The verdict

“on” is in the everyday core of Portuguese, ranked #675 in Portuguese word frequency and used as an adjective.

#675
frequency rank, Portuguese
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - ligado, ativo (na internet)

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

on vs os
50% similar
on vs ou
50% similar
on vs or
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for on
PropertyValue
Headwordon
LanguagePortuguese
Part of speechAdjective
Letters2
Frequency rank#675
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “on” sits in Portuguese frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). on lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The Portuguese entry for on is 2 letters long, classified as an adjective. Corpus data places it at rank #675 in overall Portuguese word frequency, putting it firmly in the everyday core of the language. The dominant gloss from Wiktionary reads: "ligado, ativo (na internet)".

The misspelling generator found no plausible variants for on, since its letter sequence doesn't invite the usual edit-distance slips. It also participates in 20 confusable-pair relationships, "os", "ou", "or", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

No documented word history exists for this headword, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct Portuguese form is on, spelled O-N.

Definition

  1. 1
    ligado, ativo (na internet)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 Portuguese corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "on"?
"on" is spelled O-N.
What does "on" mean?
As an adjective, "on" means: ligado, ativo (na internet)
What words are commonly confused with "on"?
"on" is commonly confused with "os", "ou", "or". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
What language does "on" come from?
"on" is a Portuguese word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “on”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct Portuguese spelling is O-N - every other letter order is a misspelling in standard orthography.
  • Don't mix it up with “os” - see the side-by-side comparison. on vs os
  • Browse more Portuguese words and confusable pairs in the same reference. Portuguese words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list