Transfer taxonomy to custom field

You can order posts by custom taxonomy terms by adding a posts_clauses filter, see below answer:

https://wordpress.stackexchange.com/a/14313/14499

Make sure that on functions.php you add both that function AND the call to add_filter(‘posts_clauses’, ‘orderby_tax_clauses’, 10, 2 );, otherwise it won’t work.

Assuming annee is the custom taxonomy, this should then work:

query_posts($query_string . '&posts_per_page=-1&orderby=annee&order=ASC');

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