この記事では語源apt（適した）に関連する英単語を紹介します。
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adapt /ədˈæpt/：適応する
adaptは「適応する」を意味し、語源はad（方向）とaptus（馴染んだ）に由来します。原義はラテン語のadaptare（調整する）で、同義語はadjust, accommodate, conformです。
英語解説と例文
Adapt means “to change yourself in a new situation”, and the etymology comes from ad (direction) and aptus (familiar). The original meaning is Latin adaptare (adapt), the synonyms are adjust, accommodate and conform.
Let’s see an example sentence.
Children easily adapt to new group.
On the other hand, the elderly have difficulty adapting to the new environment.
If a creature cannot adapt to new environment, they will become extinct.
We human also have to adapt to this Internet society to survive.
adapter /ədǽptɚ/：アダプター
adapterは「アダプター（接続機器）」を意味し、語源はadapt（適応する）に由来します。
英語解説と例文
Adapter is “a device to connect two appliances”, the etymology comes from adapt.
Let’s see example sentences.
An adapter connects several electronic devices each other.
We connect an AC adapter to wall outlets to use electric appliances.
We use USB adapter to charge batteries of a smartphone.
apt /ˈæpt/：傾向がある
aptは「傾向がある」を意味し、語源はaptus（適した）に由来します。同義語はtend to, have a tendency toです。aptは形容詞なのでbe動詞を伴います。
英語解説と例文
Apt means “having a particular tendency”, and the etymology comes from aptus (suitable). The synonyms are tend to and have a tendency to.
Apt is an adjective. Do not forget to use be-verb.
Let’s see an example sentence.
Intelligent people are apt to become rich.
Poor people are apt to lack financial literacy.
Old people are apt to become sick.
Sociable persons are apt to become happy.
aptitude /ˈæptət(j)ùːd/：学習の適正
aptitudeは「学習の適正」を意味し、語源はaptus（適した）に由来します。同義語はfitness, suitabilityです。
英語解説と例文
Aptitude means “fitness to learn”, and the etymology comes from aptus (suitable). The synonyms are fitness and suitability.
Let’s see example sentences.
Children who like computer may have aptitude for programming.
Children who like reading may have aptitude for a writer or editor.
Some companies conducts aptitude test to employ capable persons.