I use company-mode most of the time. Sometimes I use Hippie Expand to autocomplete the English words from a dictionary.

I surely can do this in company-mode too. But I prefer hippie-expand because I choose to make company-mode focus on programming stuff and hippie-expand on writing.

Solution This solution works in any environment. Step1 (OPTIONAL), download english-words.txt and place it under "~/.emacs.d/misc/".

Step 2, Copy below setup into ~/.emacs and use key binding "M-/" to complete the word: (global-set-key (kbd "M-/") 'hippie-expand) ;; The actual expansion function (defun try-expand-by-dict (old) ;; old is true if we have already attempted an expansion (unless (bound-and-true-p ispell-minor-mode) (ispell-minor-mode 1)) ;; english-words.txt is the fallback dicitonary (if (not ispell-alternate-dictionary) (setq ispell-alternate-dictionary (file-truename "~/.emacs.d/misc/english-words.txt"))) (let ((lookup-func (if (fboundp 'ispell-lookup-words) 'ispell-lookup-words 'lookup-words))) (unless old (he-init-string (he-lisp-symbol-beg) (point)) (if (not (he-string-member he-search-string he-tried-table)) (setq he-tried-table (cons he-search-string he-tried-table))) (setq he-expand-list (and (not (equal he-search-string "")) (funcall lookup-func (concat (buffer-substring-no-properties (he-lisp-symbol-beg) (point)) "*"))))) (if (null he-expand-list) (if old (he-reset-string)) (he-substitute-string (car he-expand-list)) (setq he-expand-list (cdr he-expand-list)) t) )) (setq hippie-expand-try-functions-list '(;; try-expand-dabbrev ;; try-expand-dabbrev-all-buffers try-expand-by-dict))