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//POSTS
$args = array(
	'numberposts'	=> -1,
	'post_type' => 'activites',
	'tax_query' => array(
		array(
			'taxonomy' => 'activites_categories',
			'field'    => 'slug',
			'terms'    => single_term_title("", false),
		),
	),
	'meta_key' => 'activite_order',
	'orderby' => 'meta_value_num',
	'order' => 'ASC',
);
$query = new WP_Query( $args );

\\Terms -> Categories
$current_term_id = get_queried_object()->term_id;
$term_children = get_terms( "activites_categories",
	array( 
		'child_of' => $current_term_id,
		'hide_empty' => false,
		'meta_key' => 'activite_order',
		'orderby' => 'meta_value_num',
		'order' => 'ASC',
	) 
);