When using verbal stimuli, researchers usually equate words on frequency ofuse. However, for some ambiguous words (e.g., ball as a round object or a formal dance), frequency counts fail to distinguish how often a particular meaning is used. This study evaluates the use of ratings to estimate meaning frequency.Analyses show that ratings correlate highlywith word frequency counts when orthographie and meaning frequencies should converge, are not unduly influenced by semantic factors, and may provide a better measure ofrelative meaning dominance than the word association task does. Furthermore, the ratings allow researchers to equate or manipulate frequency of meaning use for ambiguous and unambiguous words. Ratings for 211 words are reported.Lexically ambiguous words are widely used in psycholinguistic research. In word recognition studies, homonyms,' such as (baseball and vampire) bat, have been used to study context and frequency-of-meaning effects in lexical access (for a review, see Simpson, 1984Simpson, , 1994, number-of-meanings effects (e.g., Millis & Button, 1989;Rubenstein, Garfield, & Millikan, 1970), summation of priming (Balota & Paul, 1996), and other issues. Homophones, such as steel and steal, have been used to explore orthographic priming effects (e.g., Grainger & Ferrand, 1994) and to test the influence ofphonology on visual word recognition processes (e.g., Fleming, 1993; Jared & Seidenberg, 1991; VanOrden, 1987). Homographs with different pronunciations, such as wind, pronounced as Iwajndl or /wmd/, have also been used to study these questions (e.g., Kawamoto & Zernblidge, 1992). In word produetion research, homonyms and homophones have been used to investigate open-versus closed-class vocabulary differences (Dell, 1990), the locus ofword frequency effects (Jescheniak & Levelt, 1994), the effect of phonological priming on word selection (Griffin, 1995), phonology's role in subject-verb agreement errors (Bock & Eberhard, 1993), and the relationship between lexical processing stages (Cutting & Ferreira, 1999). However, part ofwhat makes ambiguous words interesting-namely, the association ofa single form with multiple meanings-also makesThe norming study was conducted at the University of IIIinois at Urbana-Champaign while the author was supported by aNational Science Foundation Fellowship. The research was made possible, in part, by grants from the National Institutes of Health (ROI-HD21011) and the National Science Foundation (SBR 94-11627). Thanks to Kathryn Bock, Victor Ferreira, Leslie Twilley, an anonymous reviewer, and, especially, Gary Deli for suggestions in the preparation ofthis manuscript and to Urbano Chaidez and Edyta Kania for their hard work and patience in data entry. Correspondence concerning this article should be sent to Z. M. Griffin, Department ofPsychology, Stanford University, Jordan Hall, Bldg. 420, Stanford, CA 94305-2130 (e-mail: griffin@ psych.stanford.edu).it diffieult to equate them with unambiguous words on the important factor of frequency of meaning use.Word freque...