1) Equal 2) Equal in duration or interval 3) Equal in time 4) Equal or uniform in time 5) Isochronous 1) Equal 2) Isochronous 
• (a.) Uniform in time; of equal time; performed in equal times; recurring at regular intervals; isochronal vibrations or oscillations.
I·soch'ro·nal adjective [ See Isochronous .] Uniform in time; of equal time; performed in equal times; recurring at regular intervals; as, isochronal vibrations or oscillations. 
isochronal 1. Of a line: connecting points at which a particular event occurs or occurred at the same time; of a diagram, depicting such lines. 2. Equal in duration or marked by or occurring at equal time intervals.isochronal, isochronous 1. Acting in uniform time, or taking place at regular intervals. 2. Equal in time; contemporary; occurring during the same time.
isochronous adjective equal in duration or interval; `the oscillations were isochronal`
equal or uniform in time. · performed in equal intervals of time. · characterized by motions or vibrations of equal duration.