adjective
- forming a straight line.
- formed by straight lines.
- characterized by straight lines.
- moving in a straight line.
adjective
- in, moving in, or characterized by a straight line or linesthe rectilinear propagation of light
- consisting of, bounded by, or formed by a straight line or lines
“forming a straight line,” 1650s, with -ar + rectiline (1560s), from Late Latin rectilineus, from rectus “straight” (see right (adj.1)) + linea “line” (see line (n.)). Related: Rectilineal (1640s).
- Relating to, consisting of, or moving in a straight line or lines.