WordNet (r) 3.0 (2006):

attend to
    v 1: get down to; pay attention to; take seriously; "Attend to
         your duties, please" [syn: attend to, take to heart]
         [ant: drop, leave out, miss, neglect, omit,
         overleap, overlook, pretermit]
    2: work for or be a servant to; "May I serve you?"; "She attends
       the old lady in the wheelchair"; "Can you wait on our table,
       please?"; "Is a salesperson assisting you?"; "The minister
       served the King for many years" [syn: serve, attend to,
       wait on, attend, assist]

Moby Thesaurus II by Grady Ward, 1.0:

95 Moby Thesaurus words for "attend to":
   abide by, act up to, adhere to, advert to, attend, auscultate,
   baby-sit, be all ears, be aware of, be engrossed in,
   be faithful to, bend an ear, bug, care for, chaperon, cherish,
   cock the ears, come down on, comply with, conform to, conserve,
   do for, do justice to, drink in, eavesdrop, examine by ear, fill,
   fix, follow, foster, fulfill, give attention, give audience to,
   give ear, give heed to, give it to, give mind to, give thought to,
   hark, hear, hear out, hearken, heed, hold by, intercept, keep,
   keep faith with, keep watch over, lend an ear, listen, listen at,
   listen in, listen to, live up to, look after, look out for,
   look to, make good, matronize, meet, mind, minister to, mother,
   not forget, nurse, nurture, observe, pay, pay attention to,
   pay out, pay regard to, preserve, protege, provide for, regard,
   respect, ride herd on, satisfy, see after, see to, serve one out,
   settle, settle the score, shepherd, sit in on, support,
   take care of, take charge of, tap, tend, turn to, watch,
   watch out for, watch over, wiretap