Which prefix means with or together?

• A. Sym
• B. Talu
• C. Tachy
• D. Tel

Answer: (A)

The concept at play is how a prefix expresses “with” or “together.” The Greek prefix syn- means with or together, and when it comes before certain sounds it changes to sym- for smooth pronunciation (before bilabial consonants like b, m, p). That’s why you see words such as symbiosis or symmetry, where the sense is “together” or “with.”

The form shown here is the same prefix, just in its sym- variation, which is exactly what carries the meaning of togetherness. The other options refer to different ideas: tachy- means fast, tel- relates to end or distance, and the last option isn’t a standard prefix in medical terminology. So the prefix that means with or together is sym-.