IRS13 Thesaurus, Phrase and Hierarchy Dictionaries chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. VII-5 IRE-3 Thesaurus-3 CRAN-l Thesaurus-3 ADI Thesaurus-i (Computer Science) (Aerodynamics and (Documentation) Aeronautical Engin[OCRerr]ring) 605 Calculate 20 Algebra 350 Calculate Compute Arithmetic Compute Calculate Interpolate 13 Evaluate Compute Sum Interpolate Derivation Plot Mathemat 428 Mathemat Recompute Newly-computed Numerical 2 Computer-based Computer 148 Add 601 Extrapolate Sum Interpolate Quadrature 7 Algebra 304 Analog 376 Arithmetic Analogue Computer 116 Mathematic Computing Machine Digital-computer 601 Computer Digital Data-processor IBM-704 Electronic- computer IBM Univac Sample Excerpts from Three Thesaurus Dictionaries Fig. 2