Define longest. longest synonyms, longest pronunciation, longest translation, English dictionary definition of longest. adj. long er , long est 1. a. Extending or traveling a relatively great distance. b. Having relatively great height; tall. c. Having the greater length of...
Uncover the truth behind the longest word in the English language, a massive 189,819-letter chemical name. Learn what it means, why it's so long, and whether it's truly considered a 'real' word.
We bring you the longest words ever. Don't read this if you have hippopotomonstrosesquippedaliophobia (fear of long words).
Longest Flights in the World Ultra-long-haul flying has stretched past 18 hours in the air. Singapore Airlines' A350-900ULR from Singapore to New York currently holds the record at 9,537 miles, and the closure of Russian airspace since 2022 has forced several Asia-Europe routes onto longer southern detours, reshuffling the rankings.
The longest non-contrived place name in the United Kingdom which is a single non-hyphenated word is Cottonshopeburnfoot (19 letters) and the longest which is hyphenated is Sutton-under-Whitestonecliffe (29 characters).
'longest' also found in these entries (note: many are not synonyms or translations):
Many of the longest words in the dictionary refer to medicine or chemistry. The nature of their work, or science in general, calls for it as it deals with very specific things.
"Longest." Vocabulary.com Dictionary, Vocabulary.com, https://www.vocabulary.com/dictionary/longest. Accessed 27 Apr. 2026. Copy citation Examples from books and articles
Longest Flights in the World 2026 — Top 20 Non-Stop Routes Ranked
Superlative form of long: most long. (archaic) Second-person singular simple present form of long. He tried for the longest time not to cry. They were half the size of her longest finger. The longest I had lasted in one foster home was six months. I asked, pointing to the longest underlined numbers at the rear of the booklet.