Glossary · Sounds and phonemic awareness
What is onset and rime?
Definition
In a one-syllable word, the onset is the consonant sound or sounds before the vowel, and the rime is the vowel sound plus any sounds that follow it.
In cat the onset is /k/ and the rime is /ăt/. In strap the onset is /str/ and the rime is /ăp/. Some words, such as in or ant, have no onset at all, but every syllable has a rime because every syllable has a vowel.
Onset and rime sit between syllables and single phonemes on the ladder of phonological awareness. Splitting a word into these two pieces is easier than splitting it into every sound, so it is a natural step for a student who can clap syllables but can't yet segment.
Rimes are also the basis of word families. Swap the onset in the -ug rime and you get bug, hug, mug and rug.
In a lesson
“I'll say the first part, you add the rest. /fl/ ... /ăg/.” The student says “flag.” Then flip it: “What is the first part of flag?”
Examples
Each word with its spelling units, one per sound.
- flagf·l·a·g
- straps·t·r·a·p
- planp·l·a·n
- scans·c·a·n
Words come from our lexicon, checked against a pronouncing dictionary. Words a student sees in our assessments are left out.
Why does this matter for the record?
If a student is stuck at onset and rime for more than a few weeks, note it. Moving on to full segmenting usually needs direct work, not more rhyming games.
Rate each skill as you teach it
Needs support, Developing, Secure. The rating schedules the review and builds the report.