4 syllables: ki, lo, par, sec. Stress on par.
/kaɪləˈpɑɹsɛk/
Say it backKiloparsec is a unit of distance used in astronomy equal to 1,000 parsecs (about 3,262 light-years). It combines the prefix kilo- with parsec to denote very large cosmic separations. In practice, it’s employed to express galactic-scale measurements and distances to stellar objects. Pronunciation focuses on syllable-timed flow and accurate placement of the -parsec segment within the word.
Tip: say it in two chunks at first (kil-o) and (parsek) then blend. Use a mirror to check mouth shapes. Record yourself and compare to native examples.
"The Andromeda Galaxy is roughly 0.78 megaparsecs away, or about 2.5 kiloparsecs downstream in the local spiral arm."
"Astronomers often cite distances in kiloparsecs when describing the Milky Way’s disk."
"The research team measured the cluster’s size to be several kiloparsecs across, indicating a vast spatial extent."
You say /ˌkɪl.oʊˈpɑːr.sɛk/ in US and UK; US often reduces the second syllable slightly to /ˌkɪl.oʊˈpɑːr.sɪk/ depending on tempo. The stress is on the second word boundary: kilo-PARSEC, with the -parsec sounding like par-sek. Start with a light ‘kil’ then a clean ‘o-’ then ‘parsec’ as par-sék. For audio, imagine saying ‘kilo’ + ‘parsec’ fluidly in one breath.
Common errors: splitting as ‘kil-o-par-sek’ with an extra or misplaced syllable; mispronouncing the second syllable as ‘pah’ instead of ‘par-’; and slurring the final -sec to ‘-sick’. Correction: say /ˌkɪ.loʊˈpɑːr.sɛk/ or /ˌkɪl.oʊˈpɑːr.sɪk/ with crisp, stressed second syllable, keep ‘parsec’ as two syllables, and finish with a clear /sɛk/ or /sɪk/ depending on accent. Practice at a slow pace.
In US, the ‘parsec’ portion commonly ends with a clear /sɛk/; in UK, you may hear /ˈpɑː.sɛk/ with shorter 'o' and less r-coloring. Australian tends to maintain /ˌkɪləˈpɑːsɛk/ with less rhoticity and a slightly flatter vowel in ‘parsec’. Focus on rhoticity (US rhotic, UK non-rhotic) and vowel quality in the first and second syllables; maintain two-syllable ‘parsec’ with final /k/.
The challenge lies in blending the multisyllabic ‘kil o-parsec’ into a smooth, two-stress word, while keeping the second syllable strong. Learners often misplace stress or flatten the vowels in the unstressed syllables. The cluster ‘par’ followed by a hard ‘sec’ requires precise tongue height and lip rounding. Practice with slow enunciation, then speed up while preserving segmental integrity.
A unique aspect is the subtle vowel reduction in the first syllable under fast speech. You should hold /ɪ/ in the first syllable and avoid merging it with /oʊ/ too early. Ensure the unstressed syllables do not mute the main stress on ‘parsec’. The two-syllable parsec portion should land firmly with a final clear /k/.
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US: rhotic; UK/AU: non-rhotic-ish in careful speech. Vowels: US /ɪ/ in ‘kil’, /oʊ/ in ‘ko’, /ɑː/ in ‘parse-’, /sɛk/ or /sɪk/ ending. In UK, closer to /ˈkɪləˌpɑːsɛk/ with less diphthongization in /ɪə/ region. Australian tends to flatter vowels and keep ‘parsec’ as /ˈpɑːsɛk/ with a robust final /k/. Practice with IPA: /ˌkɪləˈpɑːsɛk/; US: /ˌkeɪ. ljoʊˈpɑːrsɛk/ is less common; remember to maintain two-syllable ‘parsec’.
Kiloparsec derives from the combining form kilo- (from Greek χίλιοι ‘thousand’) and parsec, a unit coined by astronomers from parallax and arcsecond. Parsecs originated in the early 20th century as a distance measure defined by the parallax of one arcsecond at a distance of one parsec (3.26 light-years). The term kilo- scales parsec by a factor of one thousand. The word first appeared in astronomical literature as researchers sought practical shorthand for distances within the Milky Way and nearby galaxies, with kiloparsec becoming common in the late 20th century as observational data extended to kiloparsec scales in the Galactic disk and halos.
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Words that rhyme with "kiloparsec"
-isk sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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