The metric (SI) unit of length. m2 = square metre, m3 = cubic metre. m-1 = per metre, m-2 = per square metre, m-3 = per cubic metre.
This definition is abridged from A – Z of tree terms: A companion to British arboriculture. Read the preface. Order the book.
© 2013 Philip Wilson in association with Orange Pippin Trees
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