to bring into cooperation or agreement with a particular group, party, cause, etc.:
He aligned himself with the liberals.
to adjust (two or more components of an electronic circuit) to improve the response over a frequency band, as to align the tuned circuits of a radio receiver for proper tracking throughout its frequency range, or a television receiver for appropriate wide-band responses.
early 15c., "to range (things) in a line," from M.Fr. aligner, from O.Fr. alignier, from à "to" + lignier "to line," from L. lineare, from linea (see line). Trans. or reflective sense of "to fall into line" is from 1853. International political sense is attested from 1934.