What does the prefix syn- mean?
Syn- comes from the Greek syn, which means "with", "together" or "at the same time". It shows that several things join or coincide.
ESEN
Prefix · together / at the same time
syn-
Signals union or simultaneity: synonym, synthesis, syndrome, synergy, symphony.
Literary
Written by Bryan López, English teacher · Updated
Syn- becomes sym-
Before the letters b, m and p, syn- changes to sym- to be easier to pronounce. It is the same prefix in another form, and it means the same. When you see sym- at the start of a word, think of syn-: "together, at the same time".
How it is used
Syn- before most consonants and vowels; sym- before b, m, p:
- syn- + unifying conceptonym → synonymthesis → synthesischronize → synchronizedrome → syndromeergy → synergy
- sym- (before b/m/p)phony → symphonymetry → symmetrybol → symbolpathy → sympathybiosis → symbiosis
Pronunciation: /sɪn/ (syn-) and /sɪm/ (sym-).
How it is pronounced
syn-/sɪn/
Tap the button to hear how the prefix sounds. Each word in the table has its own audio.
Examples
Root word
With syn-
In a phrase
- onymsynonymThe teacher asked students to find a synonym for "happy."
- thesissynthesisThe final chapter presented a synthesis of all the evidence.
- dromesyndromeBurnout syndrome is now recognised by the WHO as an occupational issue.
- ergysynergyThe merger created real synergy — the combined company outperformed both.
- chronizesynchronizeThe four musicians had to synchronize perfectly throughout the piece.
- phonysymphonyBeethoven's Ninth Symphony is one of the greatest works ever written.
- biosissymbiosisClownfish and sea anemones are a classic example of symbiosis.
Common mistakes
synonym and homonym are the same thing
synonym = a word with similar meaning (happy/joyful); homonym = a word with the same pronunciation but a different meaning (sea/see)
"Synonym" (syn- = together + onym = name): words with similar or equivalent meanings. "Homonym" (homo- = same + onym = name): words that sound the same but mean different things (bear/bare, see/sea). Related types: antonym (opposite meaning) and hypernym (broader category — "animal" is a hypernym of "dog").
synergy = cooperation or teamwork
synergy = the combined energy or effect that exceeds the sum of the individual parts; the whole produces more than the parts separately
"Synergy" (syn- = together + ergon = work) implies that the combination produces a result GREATER than the sum of the parts individually — the 2+2=5 effect. Simple "cooperation" = working together without necessarily producing more. Synergy has this specific multiplicative or amplifying quality.
A trick to remember it
Think of "synchronize" (together in time): syn- = together. synchronize, symphony (syn- becomes sym- before m/p/b).
Practise what you learned
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"Happy, joyful, and content are near-___ — similar in meaning but with slightly different connotations."
Exercise 3 · Pick the right one
What is the difference between "synonym" and "homonym" in English?
Frequently asked questions
What does the prefix syn- mean in English?
The prefix syn- signals union or simultaneity: synonym, synthesis, syndrome, synergy, symphony.
How do you pronounce syn-?
The prefix syn- is pronounced /sɪn/. For example, "synonym".
Can you give an example of a word with syn-?
"onym" becomes "synonym". It is a typical example of the syn- prefix.
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