WordNet sense 1 (an imaginary line around the Earth parallel to the equator):

latitude, line of latitude, parallel of latitude

WordNet sense 2 (something having the property of being analogous to something else):

analog, analogue

WordNet sense 3 (duplicate or match):

duplicate, twin, duplicate

WordNet sense 4 (occurring or existing at the same time or having the same period or phase):

synchronous, synchronal, synchronic

WordNet sense 5 (situated or running side by side):

collateral

WordNet sense 6 (make or place parallel to something):

collimate