SUPPLEMENTARY

US also supplemental [adjective] [not gradable]Although the book does not represent a thorough course in astrophysics, it will make excellent supplementary reading.The farmer has a supplementary income from letting part of his land to campers.The money he makes from selling the vegetables he grows in his garden is supplementary to his main income.(specialized) If an angle is supplementary to another angle, it forms 180° when combined with it.An angle of 80° is supplementary to an angle of 100° - they are supplementary angles.