Princeton's WordNet

1. keep, maintain, hold(verb)

   keep in a certain state, position, or activity; e.g., "keep clean"

   "hold in place"; "She always held herself as a lady"; "The students keep me on my toes"

2. conserve, preserve, maintain, keep up(verb)

   keep in safety and protect from harm, decay, loss, or destruction

   "We preserve these archeological findings"; "The old lady could not keep up the building"; "children must be taught to conserve our national heritage"; "The museum curator conserved the ancient manuscripts"

3. sustain, keep, maintain(verb)

   supply with necessities and support

   "She alone sustained her family"; "The money will sustain our good cause"; "There's little to earn and many to keep"

4. assert, asseverate, maintain(verb)

   state categorically

5. wield, exert, maintain(verb)

   have and exercise

   "wield power and authority"

6. keep, maintain(verb)

   maintain for use and service

   "I keep a car in the countryside"; "She keeps an apartment in Paris for her shopping trips"

7. keep, maintain(verb)

   maintain by writing regular records

   "keep a diary"; "maintain a record"; "keep notes"

8. maintain, defend(verb)

   state or assert

   "He maintained his innocence"

9. uphold, maintain(verb)

   support against an opponent

   "The appellate court upheld the verdict"

10. observe, keep, maintain(verb)

    stick to correctly or closely

    "The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"

Kernerman English Learner's Dictionary

1. maintain(verb)ɪnˈteɪn

   to make continue in the same way as before

   difficult to maintain his enthusiasm for the job; to maintain a healthy weight

2. maintainɪnˈteɪn

   to keep a place or machine repaired and working correctly

   It costs a lot to maintain these public buildings.

3. maintainɪnˈteɪn

   to continue to claim that sth is true

   He maintains that he never saw the victim on the night of the murder.

4. maintainɪnˈteɪn

   to continue to say you are innocent of a crime

Wiktionary

1. maintain(Verb)

   To support (someone), to back up or assist (someone) in an action.

2. maintain(Verb)

   To keep up; to preserve; to uphold (a state, condition etc.).

3. maintain(Verb)

   To declare or affirm (a clause) to be true; to assert.

Origin: From maintenir, maintenir, from manutenere, from manu + tenere.

Webster Dictionary

1. Maintain(verb)

   to hold or keep in any particular state or condition; to support; to sustain; to uphold; to keep up; not to suffer to fail or decline; as, to maintain a certain degree of heat in a furnace; to maintain a fence or a railroad; to maintain the digestive process or powers of the stomach; to maintain the fertility of soil; to maintain present reputation

2. Maintain(verb)

   to keep possession of; to hold and defend; not to surrender or relinquish

3. Maintain(verb)

   to continue; not to suffer to cease or fail

4. Maintain(verb)

   to bear the expense of; to support; to keep up; to supply with what is needed

5. Maintain(verb)

   to affirm; to support or defend by argument

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