Final answer:
The symptom of not completely emptying the bladder when voiding, especially with an enlarged prostate diagnosis, is known as urinary retention.
Step-by-step explanation:
The symptom described by a male client who does not feel that he completely empties his bladder when he voids and has been diagnosed with an enlarged prostate is called urinary retention. This condition often occurs in men with benign prostatic hyperplasia (BPH) or an enlarged prostate gland. BPH can cause constriction of the urethra leading to difficulty in fully emptying the bladder. While urinary incontinence involves uncontrolled leakage of urine and can also be related to prostate issues, it is distinct from urinary retention.