htaccess redirect – directory and subpages to a single page

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The solution is to put the rewriterule just after RewriteEngine On.

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^definicje(.*)$ http://example.com/single-page/ [R=301,L]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>