c.1300, "to direct one's mind or energies," from O.Fr.
atendre "to expect, wait for, pay attention," from L.
attendere "give heed to," lit. "to stretch toward," from
ad- "to" +
tendere "stretch" (see
tenet). The notion is of "stretching" one's mind toward something. Sense of "take care of, wait upon" is from 1420.
Attendance "presenting oneself" (originally with intent of taking a part) is from c.1460.
Attendant "one who attends" is from 1555.
Attention "giving heed" is in Chaucer (c.1374). As a military cautionary word preparative to giving a command, it is attested from 1792.
Attentive is from 1382 (implied in
attentively).