Estimating root word vocabulary growth in normative and advantaged populations: Evidence for a common sequence of vocabulary acquisition.
Abstract
Root word vocabulary was studied in 2 normative samples (English-speaking, wide socioeconomic range) and in an advantaged sample. The authors estimated that in 2nd grade, the mean normative vocabulary was 5,200 root words, increasing to approximately 8,400 root words by 5th grade. During grades 3-5, the lowest quartile added about 3 root words a day, whereas the highest quartile added about 2.3 words a day. However, by 5th grade, children in the lowest quartile had only reached average 4th-grade level because they had such a small vocabulary in 2nd grade. There is evidence that words are learned in roughly the same order. The implications of these findings suggest (a) that greater efforts should be made to foster vocabulary acquisition in the primary years and (b) that a rough vocabulary curriculum sequence can be identified for the elementary years.
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The vocabulary size of Canadian native speakers of English was 5200 words at age six, rising to 8400 words at age nine.
“which indicated the vocabulary size of Canadian native speakers of English aged six years old as 5200 words, rising to 8400 words at the age of nine.”
From The Vocabulary Knowledge of Saudi EFL Tertiary Students (2019) · cites this paper as Biemiller and Slonim (2001)
Previous studies evidenced reciprocal and unidirectional relations between vocabulary breadth and reading comprehension because vocabulary knowledge was operationalized with the breadth of vocabulary.
“The reciprocal and unidirectional relations between vocabulary breadth and reading comprehension were evidenced in previous studies (Biemiller and Slonim 2001; Reyonlds and Turek 2012; Quinn et al. 2015; Verhoeven and van Leeuwe 2008) because vocabulary knowledge was operationalized with the breadth of vocabulary.”
From Reciprocal effects of vocabulary breadth, vocabulary depth, and reading comprehension: a cross-lagged panel analysis in Chinese-speaking EFL learners (2025) · cites this paper as Biemiller and Slonim 2001
Cites
Decoding, reading, and reading disability.
Gough, P. B., & Tunmer, W. E. (1986) · Remedial and Special Education · doi:10.1177/074193258600700104 · Cited by 3,972 · see citing works
Nagy, W. E., Herman, P. A., & Anderson, R. C. (1985) · Reading Research Quarterly · doi:10.2307/747758 · Cited by 1,249 · see citing works
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The Effects of Vocabulary Breadth and Depth on English Reading
Li, M., & Kirby, J. R. (2014) · Applied Linguistics · doi:10.1093/applin/amu007 · Cited by 172 · see citing works
The Vocabulary Knowledge of Saudi EFL Tertiary Students
Altalhab, S. (2019) · English Language Teaching · doi:10.5539/elt.v12n5p55 · Cited by 12 · see citing works
“Total 30.43 18.912 3652 T*TOTAL 3043.33 1891.233 365200 When these findings were compared with the studies conducted on native speakers (Coxhead, Nation, & Sim 2015; Biemiller & Slonim, 2001), dissimilar results were found.”
ResultInfluentialWang, T., & Zhang, H. (2025) · Humanities and Social Sciences Communications · doi:10.1057/s41599-025-04694-2 · Cited by 5 · see citing works
“The reciprocal and unidirectional relations between vocabulary breadth and reading comprehension were evidenced in previous studies (Biemiller and Slonim 2001; Reyonlds and Turek 2012; Quinn et al. 2015; Verhoeven and van Leeuwe 2008) because vocabulary knowledge was operationalized with the…”
- Authors
- Biemiller, A., & Slonim, N.
- Affiliations
- University of Toronto (CA)
- ORCID
- Biemiller, Andrew
- Venue
- Journal of Educational Psychology
- Published
- 2001-09
- Volume
- 93
- Issue
- 3
- Pages
- 498-520
- ISSN
- 0022-0663 (ISSN-L)
- 1939-2176
- OpenAlex
- W1974428938
- Cited by
- 565
- References
- 2
- Citations by year
- 2026: 6 · 2025: 9 · 2024: 13 · 2023: 17 · 2022: 16 · 2021: 30 · 2020: 32 · 2019: 58 · 2018: 23 · 2017: 32 · 2016: 59 · 2015: 27 · 2014: 37 · 2013: 29 · 2012: 39
- FWCI
- 10.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Educational Psychology (publishedVersion)
- Topics
- Social Sciences › Psychology › Developmental and Educational Psychology › Reading and Literacy Development
- Social Sciences › Psychology › Developmental and Educational Psychology › Second Language Acquisition and Learning
- Social Sciences › Psychology › Developmental and Educational Psychology › Language Development and Disorders
- Keywords
- vocabulary development, vocabulary acquisition, socioeconomic status, elementary school students
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