ADJECTIVE (2)

1. being next in a line of succession;
- Example: "he was in line for the presidency"

2. awaiting something; especially something due;
- Example: "people were in line at the checkout counter"
- Example: "she was in line for promotion"


ADVERB (1)

1. one behind another in a line or queue;
- Example: "they waited in line for the tickets"

WordNet (r) 3.0 (2006):

in line
    adv 1: one behind another in a line or queue; "they waited in
           line for the tickets"
    adj 1: being next in a line of succession; "he was in line for
           the presidency"
    2: awaiting something; especially something due; "people were in
       line at the checkout counter"; "she was in line for
       promotion"

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "in line":
   accordant, agreeably, anal, bourgeois, by consensus, compatibly,
   compulsive, concordant, concordantly, conformist, congenially,
   consonantly, conventional, corresponding, dead, dead ahead, direct,
   directly, due, due north, fittingly, formalistic, forthright,
   hand in glove, harmonious, harmoniously, in a beeline, in accord,
   in chorus, in concert, in keeping, in line with, in step,
   in unison, just right, kosher, orthodox, pedantic, plastic,
   precisianistic, right, square, straight, straight across,
   straight ahead, straightforward, straightforwards, straightly,
   stuffy, traditionalist, unanimously, undeviatingly, unswervingly,
   unveeringly, uptight, with it