maintain

As a noun retention

is retention.

As a verb maintain is

(obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As verbs the difference between become and maintain

is that become is (obsolete) to arrive, come (to a place) while maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As verbs the difference between continuing and maintain

is that continuing is while maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As a verb maintain

is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As an adjective certain is

certain.

As verbs the difference between maintain and apply

is that maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action while apply is to lay or place; to put or adjust (one thing to another);—with to; as, to apply the hand to the breast; to apply medicaments to a diseased part of the body.

As an adjective apply is

.

As a verb maintain

is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As a proper noun foster is

, variant of forster.

Maintain is a related term of represent.

As verbs the difference between maintain and represent

is that maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action while represent is to present again or anew; to present by means of something standing in the place of; to exhibit the counterpart or image of; to typify.

Avouch is a related term of maintain.

As verbs the difference between avouch and maintain

is that avouch is to declare freely and openly; to assert while maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.

As a noun avouch

is (obsolete) evidence; declaration.

As verbs the difference between maintain and clam

is that maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action while clam is to dig for clams or clam can be to produce, in bellringing, a clam or clangor; to cause to clang or clam can be to be moist or glutinous; to stick; to adhere.

As a noun clam is

a bivalve mollusk of many kinds, especially those that are edible; as, the long clam (, a huge east indian bivalve or clam can be a crash or clangor made by ringing all the bells of a chime at once or clam can be clamminess; moisture.

As verbs the difference between adopt and maintain

is that adopt is (with relationship specified) to take by choice into relationship, child, heir, friend, citizen, etc while maintain is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action.