1. (

• isotonic ,
• isosmotic

) (used of solutions) having the same or equal osmotic pressure ;

2. (

• isotonic

) relating to or characterized by the equal intervals of a musical scale; "isotonic tuning" ;

3. (

• isotonic ,

) of or involving muscular contraction in which tension is constant while length changes ;

4. (

• isotonic

) of two or more muscles; having equal tension ;