_Motion_ is _change_ of place or position in space; _transition_ is a passing from one point or position in space to another. _Motion_ may be either abstract or concrete, more frequently the former; _movement_ is always concrete, that is, considered in connection with the thing that moves or is moved; thus, we speak of the _movements_ of the planets, but of the laws of planetary _motion_; of military _movements_, but of perpetual _motion_. _Move_ is used chiefly of contests or competition, as in chess or politics; as, it is your _move_; a shrewd _move_ of the opposition. _Action_ is a more comprehensive word than _motion_. We now rarely speak of mental or spiritual _motions_, but rather of mental or spiritual _acts_ or _processes_, or of the laws of mental _action_, but a formal proposal of _action_ in a deliberative assembly is termed a _motion_. Compare ACT.
immobility, quiescence, quiet, repose, rest, stillness.
bemoan, deplore, lament, regret, rue, sorrow. bewail, grieve,
To _mourn_ is to feel or express sadness or distress because of some loss, affliction, or misfortune; _mourning_ is thought of as prolonged, _grief_ or _regret_ may be transient. One may _grieve_ or _mourn_, _regret_, _rue_, or _sorrow_ without a sound; he _bemoans_ with suppressed and often inarticulate sounds of grief; he _bewails_ with passionate utterance, whether of inarticulate cries or of spoken words. He _laments_ in plaintive or pathetic words, as the prophet Jeremiah in his "Lamentations." One _deplores_ with settled sorrow which may or may not find relief in words. One is made to _rue_ an act by some misfortune resulting, or by some penalty or vengeance inflicted because of it. One _regrets_ a slight misfortune or a hasty word; he _sorrows_ over the death of a friend.
be joyful, exult, joy, make merry, rejoice, triumph.
common, correlative, interchangeable, joint, reciprocal.
That is _common_ to which two or more persons have the same or equal claims, or in which they have equal interest or participation; in the strictest sense, that is _mutual_ (Latin _mutare_, to change) which is freely interchanged; that is _reciprocal_ in respect to which one act or movement is met by a corresponding act or movement in return; we speak of our _common_ country, _mutual_ affection, _reciprocal_ obligations, the _reciprocal_ action of cause and effect, where the effect becomes in turn a cause. Many good writers hold it incorrect to say "a _mutual_ friend," and insist that "a _common_ friend" would be more accurate; but "_common_ friend" is practically never used, because of the disagreeable suggestion that attaches to _common_, of ordinary or inferior. "_Mutual_ friend" has high literary authority (of Burke, Scott, Dickens, and others), and a considerable usage of good society in its favor, the expression being quite naturally derived from the thoroughly correct phrase _mutual_ friendship.